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Spectroelectro-chemistry sensing composite probe for measuring colloidal quantum dot thin film

A spectroelectrochemical and quantum dot technology, applied in the field of photoelectrochemical testing, can solve the problems of low sensitivity, limited sensing mode, difficult cleaning, etc., and achieve the effects of high test sensitivity, good controllability and cost saving.

Inactive Publication Date: 2015-08-05
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the light-receiving surface of the device for testing the spectrum of colloidal quantum dot thin films is mostly an arc surface, but the convex surface of the arc is not conducive to the transmission of light, the sensing mode is limited, and the sensitivity is not high (only greater than nA level photocurrent can be measured), and The optical path of the light source is difficult to determine
In the photoelectrochemical method, since the photocurrent signal is generated by the interface reaction, the real surface area of ​​the electrode is closely related to the photocurrent signal, and the light-receiving area of ​​the conventional colloidal quantum dot film is difficult to control, resulting in the controllability of the test and the experimental results. poor repeatability
The top plate of the upper hole of the quartz photometric cell for spectroelectrochemical testing is mostly square. Although the position of the electrode can be firmly fixed, the angle of the light-receiving surface of the working electrode cannot be adjusted [Jiao Kui, Lu Gang, Sun Wei, Yang Tao, Wu Junfeng, UV-Vis TLC Electrochemistry. Journal of Qingdao Institute of Chemical Technology, 2001, 22(3), 0201-0209]
In addition, the thin-layer cavity at the bottom of the quartz photometric cell is narrow and difficult to clean

Method used

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  • Spectroelectro-chemistry sensing composite probe for measuring colloidal quantum dot thin film
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  • Spectroelectro-chemistry sensing composite probe for measuring colloidal quantum dot thin film

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Embodiment 1

[0038] Embodiment 1 QDs absorption spectrum signal measurement

[0039] The present embodiment measures the ultraviolet adsorption spectrum (Abs spectrum) of CdS quantum dots synthesized by gas-hydrothermal reaction according to the following steps, wherein the synthesis method of CdS quantum dots is referred to: Yang, T.; Lu, M.; Mao, X.; Liu ,W.; Wan,L.; Miao,S.; Xu,J.,Synthesis of CdS quantum dots(QDs)via a hot-bubbling route and co-sensitized solar cells assembly.Chem.Eng.J.2013,225 ,(0),776-783.

[0040] In the present embodiment, the liquid to be tested that contains CdS quantum dots is poured into the quartz photometric cell 12, the liquid to be tested is immersed in the thin layer cavity 7, and the polytetrafluoroethylene cover 11 is covered; the light source (deuterium lamp or tungsten lamp) ) is fixed on the lower optical path channel 8, and the optical fiber interface b4 is connected to the optical fiber to output the spectral signal, and the ultraviolet absorption...

Embodiment 2

[0041] Example 2 Measurement of QDs fluorescence spectrum signal

[0042] The present embodiment measures the fluorescence spectrum (PL) of CdS quantum dots synthesized by gas-hydrothermal reaction according to the following steps:

[0043] Pour the CdS quantum dot test solution obtained at a reaction temperature of 40°C and a reaction time of 0.5h, at a reaction temperature of 180°C and a reaction time of 0.5h, and at a reaction temperature of 260°C and a reaction time of 0.5h into a quartz photometric cell, so that the test solution is full of macro Measure the solution test chamber 2, cover with a polytetrafluoroethylene cover 11, use a diode light source as the excitation light of the fluorescence spectrum (PL) and fix it on the upper optical path channel 9, connect the optical fiber to the optical fiber interface a 3 on the side to output the fluorescence spectrum signal , measure the fluorescence spectrum of quantum dots, the results are as follows Figure 7 As shown, i...

Embodiment 3

[0044] Example 3 Determination of QDs electroluminescent signal

[0045] The present embodiment measures Cd according to the following steps 6 P 7 The electroluminescence spectrum (EL) of colloidal quantum dots, test its fluorescence spectrum (PL) simultaneously by embodiment 2 identical mode:

[0046] The electrolyte (4-(dimercaptomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (containing supporting electrolyte tetrabutylammonium perchlorate (0.1M) ) is poured into the quartz photometric cell, so that the electrolyte is filled with the macro solution test chamber 2, Cd 6 P 7 Colloidal quantum dots are prepared on a clean ITO glass through a uniform gel process, and a layer of aluminum (about 400nm) is thermally evaporated on the quantum dot film through a mask plate as a working electrode ([Miao, S.; Yang, T.; Hickey, S.G.; Lesnyak, V.; Rellinghaus, B.; Xu, J.; Eychmueller, A., Emissive ZnOZn3P2 Nanocrystals: Synthesis, Optical, and Optoelectrochemical Properties....

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Abstract

The invention discloses a spectroelectro-chemistry sensing composite probe for measuring a colloidal quantum dot thin film. The spectroelectro-chemistry sensing composite probe is characterized in that a macro-quantity solution testing cavity and a thin-layered cavity are formed in a quartz luminosity pool; an interface is formed in the bottom of the thin-layered cavity; a capillary tube can be inserted in the interface; a circular cover plate is arranged on the upper end surface of the quartz luminosity pool; three electrode slots are formed in the circular cover plate; an upper light path channel and a lower light path channel are formed in the outside of the quartz luminosity pool; by the upper light path channel, the macro-quantity solution testing cavity can receive light; by the lower light path channel, the thin-layered cavity can receive light; a fiber interface (a) and a fiber interface (b) are formed in the outside of the quartz luminosity pool; and a light shielding cover is arranged on the outside of the quartz luminosity pool. By the spectroelectro-chemistry sensing composite probe, various testing requirements can be met, and standard testing data can be obtained. The spectroelectro-chemistry sensing composite probe has the advantages that the quartz luminosity pool is multipurpose, the cost is saved, electrodes are changed conveniently, the light transmitting pool is convenient to clean, and the detection precision is high.

Description

technical field [0001] The invention relates to a spectroelectrochemical sensing compound probe for measuring colloidal quantum dot films, which can be used in the field of photoelectrochemical testing. Background technique [0002] Semiconductor quantum dots have the characteristics of quantum size effect, dielectric confinement effect, multi-carrier generation and separability. Therefore, the theoretical efficiency of quantum dot-sensitized solar cells (QDSSC) using quantum dots as sensitizers can reach 66%.【 Anders Hagfeldt, Gerrit Boschloo, Licheng Sun, Lars Kloo, Henrik Pettersson.Dye-Sensitized Solar Cells.Chem.Rev., 2010,110,6595-6663], this feature makes quantum dot solar cells have important research value and application potential. The energy band of quantum dots can be adjusted with the shape and size, which also brings more space for material selection and new structure development for QDSSC. QDSSC can realize the adjustable absorption wavelength by selecting qu...

Claims

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Application Information

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IPC IPC(8): G01N21/01
Inventor 苗世顶何淑莲黄梅丁丽平何帅
Owner HEFEI UNIV OF TECH
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