Spectroelectrochemical device and method for probing colloidal semiconductor quantum dots

Abstract

The present application relates to a kind of for detecting colloidal semiconductor quantum dot spectroelectrochemical device and method.The device combines electrochemical workstation and spectroscopic detection system, for real-time monitoring the structural change of molecule and material in electrochemical reaction process.The core technology includes the accurate control of the redox state of sample, and obtains key molecular information by various spectroscopic analysis means (such as ultraviolet-visible absorption spectrum, infrared spectrum, raman spectrum etc.).Device design adopts modular structure, includes reference electrode, counter electrode and working electrode, to ensure the stability of reaction and the reliability of data.The method is suitable for the identification of electrocatalyst active site, the electronic structure regulation of material, the research of interface chemical reaction mechanism and the like.

Description

Technical Field

[0001] This invention relates to the interdisciplinary field of electrochemistry and spectroscopy, and more specifically, to a spectroelectrochemical device and a method for sample analysis thereof. This technology can be applied to fields such as materials science, catalyst research, interfacial reaction analysis, and energy conversion devices. Background Technology

[0002] Colloidal semiconductor quantum dots (such as PbS, CdSe, and CsPbX3) have attracted widespread attention in optoelectronic devices, solar cells, and catalysts due to their size-tunable optical and electrical properties. In an electrochemical environment, the redox processes of quantum dots induce changes in their electronic structure and spectral properties. These changes encompass the energy level arrangement, electron transport behavior, and surface state response characteristics of quantum dots in different redox states, and are crucial for understanding their performance. However, studying these properties of quantum dots using electrochemical methods alone presents certain technical challenges.

[0003] First, electrochemical techniques primarily provide macroscopic parameters such as current and potential, mainly reflecting the overall redox behavior of materials, while offering very little detailed information about the electronic structure and surface states of quantum dots. During electrochemical reactions, the surface states of quantum dots undergo dynamic changes due to charge transfer, forming new charge-trapping centers or reaction sites, thus significantly impacting optical properties. The evolution of these surface states is a major factor influencing the photoelectric properties of quantum dots, but electrochemical data often fails to directly reveal these molecular or atomic-level details.

[0004] Secondly, colloidal quantum dots may generate a series of short-lived intermediate states during electrochemical processes, such as the transient interactions between surface ligands and redox charge carriers. These intermediate states are characterized by rapid transitions, and electrochemical techniques struggle to meet the requirements for real-time observation of these transient processes. Furthermore, the electrochemical behavior of quantum dot materials is constrained by their size quantization effect, resulting in significantly different potential and current responses in redox reactions compared to bulk materials. This difference poses additional challenges to the interpretation of electrochemical data.

[0005] On the other hand, the optical properties of quantum dots, such as absorption and emission characteristics, vary with their electrochemical redox state. However, this spectral response is not linearly related to their redox potential and is typically influenced by complex factors such as electron-hole recombination dynamics, surface state density, and lattice structure changes. Traditional electrochemical methods cannot capture these microscopic processes that affect spectral changes, limiting a deeper understanding of the structure and optical properties of quantum dot materials under electrochemical conditions.

[0006] Therefore, spectroelectrochemical techniques, which combine spectroscopy and electrochemistry, can overcome this deficiency. By simultaneously monitoring the spectral properties of quantum dots (such as absorption, fluorescence, and Raman spectroscopy) during electrochemical reactions, it is possible to observe their electronic structure and surface state changes in real time during redox processes. This method provides high temporal resolution and multi-dimensional information, enabling in-depth analysis of the structure-property relationships of quantum dots under electrochemical conditions, and providing a more reliable design basis for their applications in catalysis, batteries, and sensing. Summary of the Invention

[0007] This invention provides a multifunctional spectroelectrochemical device that combines an electrochemical workstation with multiple spectroscopic detection systems, enabling real-time monitoring of samples under different redox states. The device's modular design supports seamless switching between multiple spectra and possesses high-precision data acquisition and analysis capabilities. Through this device and its method, richer information on the molecular structure, electronic structure, and reaction kinetics of samples during electrochemical processes can be obtained.

[0008] The present invention adopts the following technical solution: a spectroelectrochemical device for detecting colloidal semiconductor quantum dots, comprising:

[0009] An electrochemical workstation is used to apply tunable electrochemical signals to a sample to change its redox state.

[0010] The electrode assembly includes a working electrode, a reference electrode, and a counter electrode, which together constitute an electrochemical reaction unit and are connected to an electrochemical workstation. The working electrode is a glass coated with an ITO surface, on which spin-coated colloidal semiconductor quantum dots are coated. The ITO surface not covered by quantum dots is connected to the platinum electrode in the working electrode. The working electrode, reference electrode, and counter electrode are immersed in a 0.1 mM LiBF4 acetonitrile solution and together serve as a sample.

[0011] The optical module is used to generate continuous white light that matches the wavelength band monitored by the spectral detection module. The white light is absorbed after passing through the colloidal semiconductor quantum dots on the working electrode, and the remaining white light is collected and sent to the spectral detection module.

[0012] The spectral detection module is used to acquire spectral data of samples under different electrochemical states in real time;

[0013] The data processing module receives and processes the spectral data acquired by the spectral detection module, and integrates the parameters of the electrochemical workstation to analyze the correlation between spectral changes and electrochemical signals.

[0014] The electrochemical workstation is used to perform various electrochemical data acquisition methods, including constant potential, constant current, and cyclic voltammetry.

[0015] The optical module includes a halogen tungsten lamp, a first lens group, and a second lens group arranged in sequence;

[0016] The white light emitted by the halogen tungsten lamp forms a point light source located at the front focal point of the first lens group; the rear focal point of the first lens group coincides with the front focal point of the second lens group, and a sample is placed there; the beam emitted by the point light source passes through the first lens group as a paraxial beam, and after passing through the sample, it passes through the second lens group as a paraxial beam, and is focused on the fiber optic port fixed by the fiber optic holder, and then connected to the spectral detection module via the fiber optic cable.

[0017] The spectral detection module is one of the following: ultraviolet-visible spectral detection unit, infrared spectral detection unit, and Raman spectral detection unit.

[0018] The ultraviolet-visible spectroscopy detection unit is used to detect absorption changes in the wavelength range of 200 to 1100 nm to monitor changes in the electronic structure of the sample.

[0019] The infrared spectroscopy detection unit is used to detect wavelengths from 400 to 4000 cm⁻¹. -1 The spectrum is within a certain range to analyze the molecular bond vibration information of the sample.

[0020] The Raman spectroscopy detection unit is used to detect spectra from 0 to 3500 cm⁻¹. -1 Raman shifts within a certain range are used to provide information about the molecular structure of the sample.

[0021] A sample analysis method based on a spectroelectrochemical device includes the following steps:

[0022] (a) Electrochemical control parameters, including potential, current or scan rate, are set using an electrochemical workstation to control the redox state of the sample;

[0023] (b) The sample undergoes a predetermined electrochemical reaction through the electrode assembly, and the spectral data of the sample is simultaneously acquired in the spectral detection module;

[0024] (c) Return to step (a) and change the electrochemical control parameters to repeat step (b) under different electrochemical states to obtain spectral change data of the sample under different redox states.

[0025] (d) The obtained spectral data and electrochemical control parameters are transmitted to the data processing module to analyze the changes in spectral signals with electrochemical state, so as to reveal the changes in molecular and electronic structure of the sample during the redox process.

[0026] The working electrode is pre-treated as follows, including the following steps:

[0027] After immersing the working electrode in isopropanol and cleaning it with an ultrasonic cleaner for 20 minutes, the remaining solvent on the surface is washed away with ethanol and acetone in sequence. After drying, the surface organic matter is removed with an ozone cleaner.

[0028] Leave an area on the surface of the working electrode that contacts the platinum electrode in the working electrode, cover it with transparent adhesive, put it into a spin coater, spin coat a layer of CdSe / ZnCdSe quantum dots, remove the transparent adhesive, and remove the residual adhesive on the surface with lint-free paper soaked in hexane.

[0029] Based on the changes in spectral data under different electrochemical states, the spectroelectrochemical response parameters of molecules or materials in the sample are calculated. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the spectroelectrochemical device, showing the layout and connection of the electrochemical control module, spectroscopic detection module, electrode assembly, and data processing module.

[0031] Figure 2 The absorption spectra of the samples used in the examples and the current-voltage diagrams and corresponding time spectra obtained by cyclic voltammetry using a spectroelectrochemical device are shown.

[0032] Figure 3 The images show the current-time graph and the corresponding voltage spectrum obtained using the multi-potential step method in this embodiment. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings.

[0034] This invention relates to a spectroelectrochemical device for detecting colloidal semiconductor quantum dots and its application method. The device combines an electrochemical workstation and a spectroscopic detection system for real-time monitoring of molecular and material structural changes during electrochemical reactions. Its core technologies include precise control of the sample's redox state and acquisition of crucial molecular information through various spectroscopic analysis methods (such as UV-Vis absorption spectroscopy, infrared spectroscopy, and Raman spectroscopy). The device employs a modular design, including a reference electrode, a counter electrode, and a working electrode, to ensure reaction stability and data reliability. This method is applicable to fields such as the identification of active sites in electrocatalysts, the regulation of electronic structure in materials, and the study of interfacial chemical reaction mechanisms.

[0035] A spectroelectrochemical device, comprising:

[0036] An electrochemical control module is used to apply a controllable electrochemical signal to the sample to change the redox state of the sample, wherein the electrochemical signal may include voltage and current;

[0037] The spectral detection module is suitable for real-time acquisition of spectral data of samples under different electrochemical states. The spectral detection module may include an ultraviolet-visible spectral detection unit, an infrared spectral detection unit, or a Raman spectral detection unit.

[0038] The electrode assembly comprises a working electrode, a reference electrode, and a counter electrode, which together form an electrochemical reaction unit to ensure the stability and reproducibility of the sample during the electrochemical process. The working electrode is a glass coated with ITO, and the ITO surface is covered with spin-coated colloidal semiconductor quantum dots. The ITO surface not covered by quantum dots is connected to a platinum electrode. The counter electrode is a platinum wire. The reference electrode uses a silver wire as a pseudo-reference electrode. The working electrode is made of conductive indium oxide (ITO), and the electrode material is coated on a glass layer approximately 1 mm thick, directly contacting the platinum electrode. These three components together constitute the working electrode. The ITO surface not in contact with the platinum electrode is covered with spin-coated colloidal semiconductor quantum dots.

[0039] The data processing module receives and processes the data collected by the spectral detection module, integrates the parameters of the electrochemical control module, and analyzes the correlation between spectral changes and electrochemical signals.

[0040] The working electrode in the electrode assembly is made of conductive indium oxide (ITO) and is used to load the sample.

[0041] A sample analysis method using a spectroelectrochemical device includes the following steps:

[0042] (a) Set target electrochemical parameters, including potential, current or scan rate, in the electrochemical control module to control the redox state of the sample;

[0043] (b) The sample undergoes a predetermined electrochemical reaction through the electrode assembly, and the spectral data of the sample is simultaneously acquired in the spectral detection module;

[0044] (c) Repeat step (b) under different electrochemical states to obtain spectral change data of the sample under different redox states;

[0045] (d) The obtained spectral data and electrochemical control parameters are transmitted to the data processing module to analyze the changes in spectral signals with electrochemical state, so as to reveal the changes in molecular and electronic structure of the sample during the redox process.

[0046] Example:

[0047] The spectroelectrochemical device of the present invention includes:

[0048] 1. Electrochemical control module

[0049] This module is used to apply and modulate electrochemical signals to alter the redox state of a sample. It can perform various electrochemical experiments, such as potentiostatic, galvanostatic, and cyclic voltammetry.

[0050] 2. Spectral Detection Module

[0051] It includes at least one spectral detection unit, which may include:

[0052] -UV-Vis-NIR Spectroscopy Detection Unit: Used to monitor changes in the absorption or fluorescence spectrum of a sample at different wavelengths, suitable for the 200 to 1100 nm band, providing information on changes in the electronic structure of the sample.

[0053] - Infrared spectroscopy detection unit: Used to monitor molecular vibrational information of samples, suitable for 400 to 4000 cm⁻¹. -1 Wavelength bands are used to analyze changes in chemical bonds within sample molecules.

[0054] - Raman spectroscopy detection unit: suitable for 0 to 3500 cm⁻¹ -1 Raman shift bands are used to provide information about the molecular structure and bonding state of a sample.

[0055] 3. Electrode assembly

[0056] It includes a working electrode, a reference electrode, and a counter electrode. The working electrode can be made of conductive indium oxide (ITO), gold, platinum, or carbon-based materials to adapt to different sample systems, providing high electrochemical stability and good conductivity.

[0057] 4. Data Processing Module

[0058] Spectroscopic and electrochemical data are collected through a data acquisition system, and the data is processed using various algorithms, including background correction, noise reduction, and charge injection analysis. The data processing module can also generate spectral response curves for samples under different electrochemical states and provide detailed molecular and electronic structure analysis.

[0059] The working process of this device is as follows:

[0060] 1. Electrochemical regulation of the sample

[0061] The sample is placed on the working electrode, and the potential or current parameters are set through the electrochemical control module to bring the sample to a predetermined redox state.

[0062] 2. Spectral data acquisition

[0063] Start the spectral detection module, select an appropriate spectral detection unit (UV-Vis spectroscopy, infrared spectroscopy, or ultrafast visible spectroscopy), and simultaneously acquire the spectral signal of the sample under a specific electrochemical state.

[0064] 3. Data processing and analysis

[0065] The data processing module is used to process the acquired spectral data to eliminate background interference.

[0066] By comparing the spectral differences under different electrochemical states, the changes in molecular and electronic structure of the sample during the redox process can be revealed through the changes in parameters such as spectral peak position and peak intensity.

[0067] Calculate spectral response parameters to quantitatively analyze the electrochemical properties of the sample.

[0068] In one specific embodiment, the device is used to detect the spectrum of band-edge energy level transitions in CdSe / ZnCdSe colloidal semiconductor quantum dots.

[0069] After immersing the ITO working electrode in isopropanol and ultrasonically cleaning it for 20 minutes, the remaining solvent on the surface is washed away with ethanol and acetone in sequence. After drying with a hair dryer, the surface organic matter is removed with an ozone cleaner. An area is left on the surface of the ITO working electrode to contact the platinum electrode, and transparent adhesive is applied. The electrode is then placed in a spin coater to spin coat a layer of CdSe / ZnCdSe quantum dots. After removing the transparent adhesive, the surface residue is removed with lint-free paper soaked in hexane.

[0070] See Figure 1 As shown, a halogen tungsten lamp emits continuous white light covering a wavelength range of 400 to 1100 nm. An aperture is used to block most of the white light to reduce its intensity. The white light passing through the aperture approximates a point source with relatively small divergence, falling at the front focal point of lens group 1. The white light is approximated as a paraxial beam passing through the lens group and focused onto the sample cell. The sample cell is simultaneously located at the rear focal point of lens group 1 and the front focal point of lens group 2. After passing through the sample cell, the beam again passes as a paraxial beam through lens group 2 and is focused onto the fiber optic port fixed by the fiber optic holder. The beam entering the fiber is guided to a miniature spectrometer for wavelength analysis. The sample cell is assembled by connecting an ITO working electrode to a platinum working electrode and immersing it in an acetonitrile solution containing 0.1 mM lithium tetrafluoroborate (LiBF4), while simultaneously immersing a platinum counter electrode and a silver pseudo-reference electrode. The electrochemical workstation and the miniature spectrometer are programmed by a computer to operate in a specific manner, thereby simultaneously acquiring electrical and optical signals from the electrochemical process. Lens group 1 and lens group 2 are the same, each including two plano-convex lenses arranged in sequence. The first plano-convex lens refracts the incident light into parallel light before it is incident on the second plano-convex lens.

[0071] like Figure 2 As shown in (a), the first exciton absorption peak of the CdSe / ZnCdSe colloidal quantum dots is located at a wavelength of 620 nm. The response of the quantum dots to voltage was determined using cyclic voltammetry at a scan rate of 50 mV / sec. Figure 2As shown in (b), reduction and oxidation peaks appeared at -1.6V and -1.1V, respectively, indicating that there is an energy level at approximately -1.35V where a reversible redox process can occur. This energy level is identified as the conduction band bottom energy level of CdSe / ZnCdSe colloidal quantum dots.

[0072] Figure 2 The image in (c) is an uncorrected two-dimensional pseudo-color spectroelectrochemical image. It can be seen that the bleaching signal at a wavelength of 620 nm reaches its maximum at 22 seconds, which is consistent with the time point when the applied negative voltage reaches its maximum. Figure 2 In the middle (d), the bleaching signal is the signal after subtracting the surrounding baseline, corresponding to the net signals at wavelengths of 620nm and 560nm, respectively. It can be seen that the two bleaching signals are generated simultaneously at 16 seconds, corresponding to... Figure 2 (b) The time when the current begins to increase when the electrode potential is close to -1.6V. This indicates that when the potential energy crosses the conduction band bottom level, a large number of electrons are injected into the conduction band bottom of the CdSe / ZnCdSe colloidal semiconductor quantum dot, thus leading to an increase in current and a decrease in absorbance. As the electrode potential drops to approximately -1.2V and a reduction current begins to appear, the signals at wavelengths of 620nm and 560nm in the spectrum rapidly decrease, indicating that electrons are being extracted from the CdSe / ZnCdSe colloidal quantum dot back to the working electrode. The spectral signals showed good consistency throughout the three cycles, indicating that no degradation of the quantum dot occurred within the applied voltage range.

[0073] Figure 3 The results of CdSe / ZnCdSe colloidal quantum dots under the multipotential step method are shown. Figure 3 Figure (a) shows the relationship between current and time. It can be seen that each time the voltage signal jumps, a sudden jump in current signal immediately appears, followed by a rapid decrease in current. During this process, current is injected into the CdSe / ZnCdSe colloidal semiconductor quantum dot. The negative current signal originates from the current carried by electrons returning from the quantum dot to the working electrode when the potential returns from -1.8V to -1.3V after each cycle. By integrating the current-time signal for each jump, the amount of charge injected for each jump can be obtained. Figure 3 (a) and Figure 3 As can be seen in (b), the strength of the current signal is relatively stable in each cycle and each jump. Figure 2 The electrical stability results shown in (d) are consistent. Figure 3(b) shows that more electrons are injected in each jump in cycle 1 than in cycles 2 and 3. The charge injection amounts in each jump in cycles 2 and 3 are more consistent, indicating that there are more electron acceptors in cycle 1, which are composed of defects on the surface of CdSe / ZnCdSe colloidal semiconductor quantum dots and electron-accepting groups of ligands, and that the reduction process is irreversible.

[0074] Figure 3 (c) shows the stabilized spectral signals at each voltage without correction. Figure 2 Similar to (c), scattering due to irreversible reduction caused by charge injection into the ITO glass can be observed. The corrected spectrum is shown below. Figure 3 As shown in (d), a distinct bleaching signal from band-edge filling is clearly visible at wavelength 620 nm; a similar bleaching signal exists at wavelength 560 nm, but accompanied by absorption signals on both sides, with similar areas; and some alternating positive and negative signals exist at shorter wavelengths. This indicates that only the signal at 620 nm originates from bleaching caused by band-edge electron filling, while signals at other wavelengths are more due to alternating positive and negative signals caused by energy level shifts resulting from electron doping, suggesting that these transitions do not involve the conduction band bottom energy level. By analyzing the signal intensity at 620 nm and taking its first derivative, as shown... Figure 3 As shown in (e), a normally distributed signal can be obtained, reflecting the degree of change in the bleaching signal of the quantum dot under each voltage jump. The signal with a wavelength of 620 nm corresponds to the bottom conduction band energy level of the CdSe / ZnCdSe colloidal semiconductor quantum dot. Therefore, we can obtain the signal from... Figure 3 (e) shows that for this batch of sub-points, the conduction band bottom energy levels are concentrated at -1.58V, with a full width at half maximum (FWHM) of 0.22V. The conduction band bottom energy levels are distributed from -1.3V to -1.8V. These results are consistent with... Figure 2 The results obtained by cyclic voltammetry in (b) are consistent with those obtained by cyclic voltammetry, but provide specific information about the energy level of the injected electron, as well as the specific attribution of the absorption signal in the spectrum, and provide a specific reflection of the energy level shift caused by the injected electron.

[0075] The spectroelectrochemical device of this invention can provide real-time molecular and material structure information during electrochemical reactions, helping researchers to accurately understand the chemical changes in redox processes. It is particularly suitable for the study of the structure-performance relationship of new energy materials, electrocatalysts, and optoelectronic materials, and has high industrial and scientific research application value.

Claims

1. A spectroelectrochemical device for detecting colloidal semiconductor quantum dots, characterized in that, include: An electrochemical workstation is used to apply tunable electrochemical signals to a sample to change its redox state. The electrode assembly includes a working electrode, a reference electrode, and a counter electrode, which together constitute an electrochemical reaction unit and are connected to an electrochemical workstation. The working electrode is a glass coated with an ITO surface, and the ITO surface is coated with spin-coated colloidal semiconductor quantum dots. The ITO surface not covered by quantum dots is connected to the platinum electrode in the working electrode. The working electrode, reference electrode, and counter electrode are immersed in an acetonitrile solution and together serve as a sample. The optical module is used to generate continuous white light that matches the wavelength band monitored by the spectral detection module. The white light is absorbed after passing through the colloidal semiconductor quantum dots on the working electrode, and the remaining white light is collected and sent to the spectral detection module. The spectral detection module is used to acquire spectral data of samples under different electrochemical states in real time; The data processing module receives and processes the spectral data acquired by the spectral detection module, and integrates the parameters of the electrochemical workstation to analyze the correlation between spectral changes and electrochemical signals.

2. The spectroelectrochemical device for detecting colloidal semiconductor quantum dots according to claim 1, characterized in that, The electrochemical workstation is used to perform various electrochemical data acquisition methods, including constant potential, constant current, and cyclic voltammetry.

3. The spectroelectrochemical device for detecting colloidal semiconductor quantum dots according to claim 1, characterized in that, The optical module includes a halogen tungsten lamp, a first lens group, and a second lens group arranged in sequence; The white light emitted by the halogen tungsten lamp forms a point light source located at the front focal point of the first lens group; The rear focal point of the first lens group coincides with the front focal point of the second lens group, and the sample is set up. The beam emitted by the point light source passes through the first lens group as a paraxial beam, and after passing through the sample, it passes through the second lens group as a paraxial beam. It is then focused on the fiber optic port fixed by the fiber optic holder and connected to the spectral detection module via the fiber optic cable.

4. The spectroelectrochemical device for detecting colloidal semiconductor quantum dots according to claim 1, characterized in that, The spectral detection module is one of the following: ultraviolet-visible spectral detection unit, infrared spectral detection unit, and Raman spectral detection unit.

5. The spectroelectrochemical device for detecting colloidal semiconductor quantum dots according to claim 4, characterized in that, The ultraviolet-visible spectroscopy detection unit is used to detect absorption changes in the wavelength range of 200 to 1100 nm to monitor changes in the electronic structure of the sample.

6. The spectroelectrochemical device for detecting colloidal semiconductor quantum dots according to claim 4, characterized in that, The infrared spectroscopy detection unit is used to detect wavelengths from 400 to 4000 cm⁻¹. -1 The spectrum is within a certain range to analyze the molecular bond vibration information of the sample.

7. The spectroelectrochemical device for detecting colloidal semiconductor quantum dots according to claim 4, characterized in that, The Raman spectroscopy detection unit is used to detect spectra from 0 to 3500 cm⁻¹. -1 Raman shifts within a certain range are used to provide information about the molecular structure of the sample.

8. A sample analysis method based on the spectroelectrochemical device according to any one of claims 1 to 7, characterized in that, Includes the following steps: (a) Electrochemical control parameters, including potential, current or scan rate, are set using an electrochemical workstation to control the redox state of the sample; (b) The sample undergoes a predetermined electrochemical reaction through the electrode assembly, and the spectral data of the sample is simultaneously acquired in the spectral detection module; (c) Return to step (a) and change the electrochemical control parameters to repeat step (b) under different electrochemical states to obtain spectral change data of the sample under different redox states. (d) The obtained spectral data and electrochemical control parameters are transmitted to the data processing module to analyze the changes in spectral signals with electrochemical state, so as to reveal the changes in molecular and electronic structure of the sample during the redox process.

9. The sample analysis method of the spectroelectrochemical device according to claim 8, characterized in that, The working electrode is pre-treated as follows, including the following steps: After immersing the working electrode in isopropanol and cleaning it with an ultrasonic cleaner for 20 minutes, the remaining solvent on the surface is washed away with ethanol and acetone in sequence. After drying, the surface organic matter is removed with an ozone cleaner. Leave an area on the surface of the working electrode that contacts the platinum electrode in the working electrode, cover it with transparent adhesive, put it into a spin coater, spin coat a layer of CdSe / ZnCdSe quantum dots, remove the transparent adhesive, and remove the residual adhesive on the surface with lint-free paper soaked in hexane.

10. The sample analysis method of the spectroelectrochemical device according to claim 8, characterized in that, Also includes: Based on the changes in spectral data under different electrochemical states, the spectroelectrochemical response parameters of molecules or materials in the sample are calculated.

Images