Two-dimensional NbMoO6 ultraviolet detector and application thereof

Abstract

The invention provides a two-dimensional NbMoO6 ultraviolet detector and application thereof.The ultraviolet detector comprises a substrate, an NbMoO6 nanosheet and two metal electrodes, the two metal electrodes are located on the two sides of the NbMoO6 nanosheet, and the NbMoO6 nanosheet is of a two-dimensional structure; wherein the ultraviolet detector has obvious light response in an ultraviolet light wave band. The ultraviolet detector is constructed and formed based on the NbMoO6 nanosheets, the ultraviolet detector has excellent ultraviolet light detection capability and can be applied to ultraviolet imaging sensing, and the application of the two-dimensional molybdenum niobate ultraviolet detector in many fields is greatly expanded.

Description

Technical Field

[0001] The embodiments of the present application belong to the technical field of ultraviolet detectors, and specifically relate to a two-dimensional NbMoO6 ultraviolet detector and its application. Background Art

[0002] Layered oxides have attracted widespread attention due to their strong stability and tunable structures. Layered oxides cover insulators, semiconductors, and metals and are composed of single or multiple corner-sharing metal oxide sheets. Unlike typical two-dimensional inorganic materials, layered niobates consist of dynamically disordered backbones and soft lattices. This allows researchers to access a large number of new two-dimensional materials with customizable functionalities, surpassing the structural diversity of bulk analogs. Single-layer niobates can be exfoliated from bulk materials using various methods. Therefore, it is highly desirable to explore the optoelectronic properties of new two-dimensional niobate materials.

[0003] NbMoO6, an inorganic wide-bandgap niobate, has attracted increasing attention due to its unique structure and promising properties. On the one hand, NbMoO6 exhibits strong chemical stability, meaning it resists degradation when exposed to adverse conditions such as temperature and humidity, making it suitable for a wide range of environmental factors. On the other hand, NbMoO6 exhibits a wide bandgap and is non-toxic. However, little has been reported on the optoelectronic properties of NbMoO6. Therefore, developing a novel NbMoO6 for use in optoelectronic devices is of great scientific and practical significance. Summary of the Invention

[0004] The embodiments of the present application aim to solve at least one of the technical problems existing in the prior art and provide a two-dimensional NbMoO6 ultraviolet detector and its application.

[0005] An embodiment of the present application provides a two-dimensional NbMoO6 ultraviolet detector, which includes a substrate, a NbMoO6 nanosheet and two metal electrodes, wherein the two metal electrodes are located on both sides of the NbMoO6 nanosheet, and the NbMoO6 nanosheet is a two-dimensional structured nanosheet; wherein the ultraviolet detector has a light response in the ultraviolet light band.

[0006] In some embodiments of the present application, under the conditions of 320 nm light illumination and 3 V voltage, the responsivity of the UV detector is 210 A / W, and the detectivity of the UV detector is 2.58×10 12 Jones, the rising response time of the ultraviolet detector is 1.8ms, and the falling response time of the ultraviolet detector is 125ms.

[0007] In some embodiments of the present application, under the conditions of 320 nm light illumination and 3 V voltage, the photocurrent of the UV detector is 140 nA.

[0008] In some embodiments of the present application, the UV detector is constructed by standard photolithography of NbMoO6 nanosheets.

[0009] In some embodiments of the present application, the NbMoO6 nanosheets are prepared by solid sintering and liquid phase exfoliation methods.

[0010] In some embodiments of the present application, the NbMoO6 nanosheets are formed by the following method: Li2CO3, Nb2O5 and MoO3 are mixed and fully ground, and then calcined to obtain LiNbMoO6 product; The LiNbMoO6 product is placed in a HNO3 solution at 40-60°C and shaken for 4-6 days to obtain a HNbMoO6 product; The HNbMoO6 product is placed in a tetrabutylammonium hydroxide solution at 40-60° C., shaken for 4-6 days, and centrifuged and washed to obtain NbMoO6 nanosheets.

[0011] In some embodiments of the present application, the molar ratio of Li2CO3, Nb2O5 and MoO3 is 1:1:2.

[0012] In some embodiments of the present application, the calcination treatment is performed at a temperature of 480-680° C., in an air atmosphere, for a time of 22-26 hours.

[0013] In some embodiments of the present application, the ultraviolet detector is a NbMoO6 single nanosheet ultraviolet detector, or the ultraviolet detector is a NbMoO6 nanosheet thin film ultraviolet detector.

[0014] In a second aspect, the present application proposes an application of a two-dimensional NbMoO6 ultraviolet detector, wherein the two-dimensional NbMoO6 ultraviolet detector described in any of the above embodiments is used for ultraviolet detection and imaging.

[0015] This application proposes a two-dimensional NbMoO6 ultraviolet detector and its applications. The UV detector comprises a substrate, a NbMoO6 nanosheet, and two metal electrodes, the two metal electrodes being located on either side of the two-dimensional NbMoO6 nanosheet. The UV detector exhibits a significant photoresponse in the ultraviolet band. This application proposes a UV detector constructed based on the NbMoO6 nanosheet. The UV detector exhibits excellent UV light detection capabilities and can be applied to UV imaging sensing, greatly expanding the application of the two-dimensional molybdenum niobate UV detector in many fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The morphology of the NbMoO6 nanosheets of the embodiment of the present application is characterized; wherein, Figure 1 (a) is a scanning electron microscope image of NbMoO6 nanosheets; Figure 1 (b) is an optical microscope image of NbMoO6 nanosheets; Figure 1 (c) is an atomic force microscope image of NbMoO6 nanosheets; Figure 1 (d) to (f) are transmission electron microscopy mapping images of Nb, Mo, and O elements respectively; Figure 2 This is a spectral characterization of the NbMoO6 nanosheets of the embodiment of the present application; wherein, Figure 2 (a) is the UV-visible absorption spectrum; Figure 2 (b) is the corresponding optical band gap spectrum; Figure 2 (c) to (e) are the X-ray energy spectra of Nb3d, Mo 3d, and O 1s in NbMoO6 nanosheets; Figure 3 The photoelectric performance of the NbMoO6 single nanosheet UV detector according to the embodiment of the present application; Figure 3 (a) is an atomic force microscope image of a single NbMoO6 nanosheet UV detector; Figure 3 (b) is the IV diagram of a single NbMoO6 nanosheet UV detector; Figure 3 (c) is the IT diagram of the NbMoO6 nanosheet UV detector; Figure 3 (d) is the response time diagram of a single NbMoO6 nanosheet UV detector; Figure 3 (e) is the responsivity diagram of a single NbMoO6 nanosheet UV detector; Figure 3 (f) is the detectivity diagram of a single NbMoO6 nanosheet UV detector; Figure 4 The photoelectric performance and imaging of the NbMoO6 nanosheet thin film UV detector according to the embodiment of the present application; Figure 4 (a) is the IV diagram of the NbMoO6 nanosheet thin film UV detector; Figure 4 (b) is the IT diagram of the NbMoO6 nanosheet thin film UV detector; Figure 4 (c) is a schematic diagram of the NbMoO6 nanosheet film UV detector imaging system; Figure 4 (d) in the equation corresponds to Figure 4 (c) Imaging results of the NbMoO6 nanosheet thin film UV detector. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the disclosure. The described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without the need for creative work are within the scope of protection of the present application.

[0018] An embodiment of the present application provides a two-dimensional NbMoO6 ultraviolet detector, which includes a substrate, a NbMoO6 nanosheet and two metal electrodes, wherein the two metal electrodes are located on both sides of the NbMoO6 nanosheet, and the NbMoO6 nanosheet is a two-dimensional structured nanosheet; wherein the ultraviolet detector has an obvious light response in the ultraviolet light band.

[0019] This application constructs an ultraviolet detector based on NbMoO6 nanosheets. The ultraviolet detector has excellent ultraviolet light detection capabilities and can be applied to ultraviolet imaging sensing, greatly expanding the application of the two-dimensional molybdenum niobate ultraviolet detector in many fields.

[0020] Specifically, the NbMoO6 nanosheet and the two metal electrodes are disposed on a substrate, and the two metal electrodes are located on opposite sides of the NbMoO6 nanosheet.

[0021] In some embodiments of the present application, under the conditions of 320 nm light illumination and 3 V voltage, the responsivity of the UV detector is 210 A / W, and the detectivity of the UV detector is 2.58×10 12 Jones, the rising response time of the ultraviolet detector is 1.8ms, and the falling response time of the ultraviolet detector is 125ms, which shows that the ultraviolet detector has good photoelectric performance under 320 nm light and 3 V voltage conditions.

[0022] In some embodiments of the present application, under the conditions of 320 nm light and 3 V voltage, the photocurrent of the UV detector is 140 nA, which indicates that the UV detector has excellent UV light response under the conditions of 320 nm light and 3 V voltage.

[0023] It should be understood that the ultraviolet detector includes structures such as a substrate, NbMoO6 nanosheets and metal electrodes. In other preferred embodiments, the ultraviolet detector may also include other structures, which are not specifically limited.

[0024] In some embodiments of the present application, the UV detector is constructed by a standard photolithography process, wherein NbMoO6 nanosheets are dispersed in ethanol to form a dispersion, and the dispersion droplets are applied to a SiO2 / Si substrate, and standard photolithography, electrode deposition and other processes are performed to form a UV detector.

[0025] In some embodiments of the present application, the NbMoO6 nanosheets are prepared by solid sintering and liquid phase exfoliation. The preparation method of the NbMoO6 nanosheets comprises the following steps: S100: Li2CO3, Nb2O5 and MoO3 are mixed and fully ground, and then calcined to obtain LiNbMoO6 product.

[0026] Specifically, Li2CO3, Nb2O5 and MoO3 are mixed in a molar ratio of 1:1:2 and fully ground, and calcined in a muffle furnace, wherein the calcination temperature is 480~680℃, the combustion atmosphere is air, and the calcination time is 22~26 hours.

[0027] In some preferred embodiments, the calcination temperature is 480°C, 580°C, 680°C, etc. Most preferably, the calcination temperature is 580°C.

[0028] In some preferred embodiments, the calcination time is 22 hours, 23 hours, 24 hours, 25 hours, or 26 hours. Most preferably, the calcination time is 24 hours.

[0029] S200: placing the LiNbMoO6 product in a HNO3 solution at 40-60°C and shaking for 4-6 days to obtain a HNbMoO6 product.

[0030] In some preferred embodiments, the temperature of the HNO 3 solution is 40° C., 50° C., or 60° C., and most preferably, the temperature of the HNO 3 solution is 50° C.

[0031] In some preferred embodiments, the LiNbMoO6 product is placed in the HNO3 solution and shaken for 4 days, 5 days, or 6 days. Most preferably, the LiNbMoO6 product is placed in the HNO3 solution and shaken for 5 days.

[0032] S300: placing the HNbMoO6 product into a tetrabutylammonium hydroxide solution at 40-60° C., shaking for 4-6 days, and washing by centrifugation to obtain NbMoO6 nanosheets.

[0033] In some preferred embodiments, the temperature of the tetrabutylammonium hydroxide solution is 40°C, 50°C, or 60°C. Most preferably, the temperature of the tetrabutylammonium hydroxide solution is 50°C.

[0034] In some preferred embodiments, the HNbMoO6 product is placed in the tetrabutylammonium hydroxide solution and shaken for 4 days, 5 days, or 6 days. Most preferably, the HNbMoO6 product is placed in the tetrabutylammonium hydroxide solution and shaken for 5 days.

[0035] It should be understood that in order to avoid agglomeration of NbMoO6 nanosheets, the NbMoO6 nanosheets can be dispersed in ethanol after centrifugal washing for subsequent use.

[0036] In this embodiment, NbMoO6 nanosheets are prepared by high-temperature calcination, protonation and liquid phase exfoliation, which is a simple and easy-to-operate preparation method.

[0037] The length of the NbMoO6 nanosheets prepared according to the above preparation method is 1~7 microns, and the thickness of the NbMoO6 nanosheets is 1~10 nm.

[0038] In some embodiments of the present application, the two-dimensional NbMoO6 ultraviolet detector can be a NbMoO6 single nanosheet ultraviolet detector or a NbMoO6 nanosheet thin film ultraviolet detector, wherein the NbMoO6 single nanosheet ultraviolet detector is an ultraviolet detector constructed of a single NbMoO6 nanosheet, and the NbMoO6 nanosheet thin film ultraviolet detector is an ultraviolet detector constructed of multiple NbMoO6 nanosheets.

[0039] In a second aspect, the present application proposes an application of a two-dimensional NbMoO6 ultraviolet detector, wherein the two-dimensional NbMoO6 ultraviolet detector described in any of the above embodiments is used for ultraviolet detection and imaging.

[0040] The following will further illustrate the preparation method of NbMoO6 nanosheets and the performance of the UV detector with reference to specific examples: Example 1: The preparation method of NbMoO6 nanosheets comprises the following steps: S100: Li2CO3, Nb2O5 and MoO3 were mixed in a molar ratio of 1:1:2 and fully ground, and calcined at 580°C in an air environment in a muffle furnace for 24 hours to obtain LiNbMoO6 product.

[0041] S200: placing the LiNbMoO6 product in a 50°C HNO3 solution and shaking for 5 days to obtain a HNbMoO6 product.

[0042] S300: placing the HNbMoO6 product into a tetrabutylammonium hydroxide solution at 50°C, shaking for 5 days, and washing by centrifugation to obtain NbMoO6 nanosheets dispersed in ethanol by centrifugation.

[0043] like Figure 1As shown in (a) to (c), the morphology of NbMoO6 nanosheets is characterized by a clear two-dimensional structure, wherein the length of the NbMoO6 nanosheets is 1 to 7 microns, and the thickness of the NbMoO6 nanosheets is 1 to 10 nm. Figure 1 As shown in (d) to (f), the nanosheets of this embodiment contain Nb, Mo, and O elements.

[0044] like Figure 2 As shown in FIG, the X-ray photoelectron spectra of Nb, Mo, and O elements show that NbMoO6 was synthesized in this embodiment. Figure 2 As shown in (b), the band gap of NbMoO6 nanosheets is 3.28 eV.

[0045] Furthermore, a NbMoO6 single nanosheet UV detection device was fabricated through standard electron beam lithography, metal electrode deposition and lift-off processes, and the device's photoelectric performance was tested at room temperature.

[0046] like Figure 3 As shown in Figure 2, the NbMoO6 single nanosheet UV detector has good photoelectric performance under 320 nm light and 3 V voltage conditions. Figure 3 As shown in (a) and (b), the device has good UV light response; Figure 3 As shown in (c), the rising response speed of the device is 1.8ms and the falling response speed is 125ms; Figure 3 As shown in (d), the device has a high responsivity of 210 A / W; Figure 3 As shown in (e), the device has a higher detector with a detectivity of 2.58×10 12 Jones. It can be seen that the NbMoO6 single nanosheet UV detector has excellent UV detection performance under 320 nm light and 3 V voltage conditions.

[0047] Furthermore, NbMoO6 nanosheet thin film UV detection devices were manufactured through standard electron beam lithography, metal electrode deposition and lift-off processes, and the room temperature photoelectric performance of the thin film UV detection devices was tested.

[0048] like Figure 4 As shown in Figure 2, the NbMoO6 nanosheet thin film UV detector has excellent UV photoresponse under 320 nm light and 3 V voltage conditions. Figure 4 As shown in (a), the photocurrent of the NbMoO6 nanosheet thin film UV detector can reach 140nA; Figure 4 As shown in (b), the NbMoO6 nanosheet thin film UV detector has a large light-on ratio; Figure 4 (a) and (b) show that the NbMoO6 nanosheet thin film UV detector has good UV detection performance; Figure 4As shown in (c) and (d), the NbMoO6 nanosheet thin film UV detector has good UV imaging sensing performance. It can be seen that the NbMoO6 nanosheet thin film UV detector has excellent UV detection performance under 320 nm light and 3 V voltage conditions.

[0049] This application proposes a two-dimensional NbMoO6 ultraviolet detector and its application, which has the following beneficial effects compared with the existing technology: The NbMoO6 nanosheet UV detector constructed for the first time in this application has excellent UV light detection capabilities and can be used in UV imaging sensing, expanding the application of two-dimensional molybdenum niobate in many fields.

[0050] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present application, and the present application is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present application, and such modifications and improvements are also considered to be within the scope of protection of the present application.

Claims

1. A two-dimensional NbMoO6 ultraviolet detector, characterized in that: The ultraviolet detector includes a substrate, a NbMoO6 nanosheet and two metal electrodes, wherein the two metal electrodes are located on both sides of the NbMoO6 nanosheet, and the NbMoO6 nanosheet is a two-dimensional structure nanosheet; wherein the ultraviolet detector has a light response in the ultraviolet light band.

2. The two-dimensional NbMoO6 ultraviolet detector according to claim 1, characterized in that: Under the conditions of 320 nm light illumination and 3 V voltage, the responsivity of the UV detector is 210 A / W, and the detectivity of the UV detector is 2.58×10 12 Jones, the rising response time of the ultraviolet detector is 1.8ms, and the falling response time of the ultraviolet detector is 125ms.

3. The two-dimensional NbMoO6 ultraviolet detector according to claim 1, characterized in that: Under the conditions of 320 nm light illumination and 3 V voltage, the photocurrent of the UV detector is 140 nA.

4. The two-dimensional NbMoO6 ultraviolet detector according to claim 1, characterized in that The UV detector was constructed by standard photolithography of NbMoO6 nanosheets.

5. The two-dimensional NbMoO6 ultraviolet detector according to claim 1, characterized in that: The NbMoO6 nanosheets are prepared by solid sintering and liquid phase exfoliation methods.

6. The two-dimensional NbMoO6 ultraviolet detector according to claim 5, characterized in that The NbMoO6 nanosheets are formed by the following method: Li2CO3, Nb2O5 and MoO3 are mixed and fully ground, and then calcined to obtain LiNbMoO6 product; The LiNbMoO6 product is placed in a HNO3 solution at 40-60°C and shaken for 4-6 days to obtain a HNbMoO6 product; The HNbMoO6 product is placed in a tetrabutylammonium hydroxide solution at 40-60° C., shaken for 4-6 days, and centrifuged and washed to obtain NbMoO6 nanosheets.

7. The two-dimensional NbMoO6 ultraviolet detector according to claim 6, characterized in that: The molar ratio of Li2CO3, Nb2O5 and MoO3 is 1:1:

2.

8. The two-dimensional NbMoO6 ultraviolet detector according to claim 6, characterized in that: The calcination treatment is performed at a temperature of 480-680° C., in an air atmosphere, for a time of 22-26 hours.

9. The two-dimensional NbMoO6 ultraviolet detector according to claim 1, characterized in that: The ultraviolet detector is a NbMoO6 single nanosheet ultraviolet detector, or the ultraviolet detector is a NbMoO6 nanosheet thin film ultraviolet detector.

10. Application of a two-dimensional NbMoO6 ultraviolet detector, characterized in that: The two-dimensional NbMoO6 ultraviolet detector according to any one of claims 1 to 9 is used for ultraviolet detection and imaging.

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