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Chemical senor, method and application on basis of laser effects in fluorescence conjugated polymer

A conjugated polymer and chemical sensor technology, applied in the field of chemical sensing, can solve the problems of low fluorescence intensity and wide spectrum, and achieve the effects of wide application prospects, high sensitivity, and strong anti-interference ability

Inactive Publication Date: 2011-06-15
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with traditional sensors based on fluorescence effects, this sensor utilizes the high intensity, monochromaticity, and threshold characteristics of laser light, which can overcome the shortcomings of low intensity, wide spectrum, and easy interference of fluorescence in traditional fluorescent chemical sensors. High sensitivity, fast response and strong anti-interference ability

Method used

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  • Chemical senor, method and application on basis of laser effects in fluorescence conjugated polymer
  • Chemical senor, method and application on basis of laser effects in fluorescence conjugated polymer
  • Chemical senor, method and application on basis of laser effects in fluorescence conjugated polymer

Examples

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Embodiment 1

[0030]The process of preparing a distributed Bragg feedback cavity by laser interference lithography: 1. Ultrasonic cleaning of the quartz substrate with concentrated sulfuric acid, acetone, and deionized water for 10 minutes each, and drying; 2. Photoresist 6809 Coat the quartz sheet completely, let it stand for 20 minutes, and throw the glue at 2000 rpm for 30 seconds; 3. Bake the polished quartz sheet at 65°C for 3 minutes, at 95°C for 5 minutes, and then at 0.5°C Cooling at the speed of / min; 4. In the laser interference exposure device, such as figure 2 As shown, at an incident angle of 23°, at 210mJ / cm 2 5. Bake the exposed sample for 2 minutes at 65°C and 7 minutes at 95°C; 5. Put the sample in the developer solution for 6 minutes; 6. Rinse with deionized water 7. Bake the sample at 200°C for 30 minutes; 8. Transfer the periodic grating pattern formed on the photoresist to the quartz plate with glass etching solution for 5 minutes. Finally, a distributed Bragg feedba...

Embodiment 2

[0032] The process of preparing the planar optical waveguide resonant cavity by the film-forming method of throwing glue: 1. Weigh a certain amount of poly-9,9-dioctylfluorene (PFO) and porphyrin metal complex (TPP or MTPP), and prepare 5mL of toluene solution, the concentration ratio of the two is 300:1, and the PFO concentration is 8mg / mL; 2. Throw the mixed solution on a quartz plate by throwing gel film-forming method at a speed of 1500 rpm for 30 seconds, and then place it in a vacuum for drying . It has been determined that the thickness of the film on the quartz plate is about 150nm, and its refractive index (about 1.7) is greater than that of the quartz plate (about 1.5) and air (about 1), thus forming a three-layer planar optical waveguide resonant cavity.

Embodiment 3

[0034] The process of preparing photonic crystal microcavity by vertical deposition method: 1. Mix 2.08g tetraethyl orthosilicate (TEOS) with 50mL absolute ethanol in a conical flask; 2. Separately mix 3.00g deionized water, 3.85mL concentrated Mix ammonia water and 40mL absolute ethanol in another Erlenmeyer flask; 3. Mix the two liquids under magnetic stirring at room temperature, and continue to stir for 20h to obtain 200nm SiO 2 Particle dispersion; 4. Insert the cleaned quartz slice vertically into 8mL SiO2 2 In a 10mL container of particle dispersion, at room temperature, with the volatilization of ethanol and water in the dispersion, SiO 2 The particles focus on the surface of the quartz sheet, and under the action of capillary force, a three-dimensional ordered SiO is formed on the substrate. 2 colloidal crystals. After the ethanol and water were completely volatilized, the substrate was taken out, and the crystal morphology was observed with a scanning electron micr...

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Abstract

The invention relates to a chemical sensor, a method and application on the basis of laser effects in a fluorescence conjugated polymer. The sensor comprises micro resonant cavities and the fluorescence conjugated polymer combined with the micro resonant cavities. The fluorescence conjugated polymer is not only used as a sensing material, but also used as a laser gain medium. The fluorescence conjugated polymer is pumped by pulse laser and is modulated by various micro resonant cavities to generate and output excited and irradiated laser. After the fluorescence conjugated polymer reacts with an analyte, the fluorescence intensity and the gain coefficient of the polymer are changed so as to influence the laser propagation characteristic in the micro resonant cavities and change the output intensity of the laser, namely a sensing function can be realized. In the inention, the high intensity, the monochromaticity and the threshold value characteristic of the laser are utilized, the defects of low intensity, wide spectrum and low anti-interference capacity of fluorescence in the conventional fluorescence chemical sensor are overcome, and the chemical sensor has high sensitivity, high response speed and strong anti-interference capacity. Short-distance and remote detection of chemicals such as environmental pollutants, poison, chemical substances, biological material and the like can be realized simultaneously.

Description

technical field [0001] The invention belongs to the technical field of chemical sensing, in particular to a chemical sensor based on the laser effect in fluorescent conjugated polymers. Background technique [0002] A chemical sensor is a miniaturized molecular device designed for real-time detection of a specific component in a system. Chemical sensors with fluorescence as the output signal are popular, because the fluorescence signal is easier to observe whether in solution or on the interface, and because the fluorescence signal is very sensitive, the lower limit concentration of the sensor detection is often low. In recent years, fluorescent sensors based on conjugated polymers have shown their own advantages and developed rapidly. Containing a rigid conjugated main chain is an important feature of conjugated polymers. Multiple light-emitting units are linked together by double bonds or triple bonds to form a molecular chain. This molecular chain effect can amplify the ...

Claims

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Application Information

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IPC IPC(8): G01N21/64H01S3/16
Inventor 邓常敏贺庆国何超程建功曹慧敏
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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