目录
摘要Ⅱ
关键词Ⅱ
AbstractⅢ
引言
引言1
1材料与方法8
1.1实验部分8
1.2实验流程8
1.3材料与方法9
2结果与讨论10
2.1Au@Ag NPs的合成与表征10
2.2Au@Ag NPs/ TiO2 NRs的制备与形貌表征12
2.3电极的PEC性能16
2.4草甘膦检测16
2.5结论18
致谢19
参考文献19
基于贵金属半导体异质结的光电化学有机磷农药检测研究
摘 要
作为一种新兴的分析技术，光电化学（PEC）生物传感引起了广泛的关注。由于激发源（光）和检测信号（电流）分属不同的类型。PEC生物传感器的背景信号大大降低，并且具有较高的灵敏度。该检测原理是，在入射光的激发下，生物特异性识别元件与相应靶标之间的生物识别作用导致光敏纳米材料产生的信号发生变化。基于此，本文设计制备Au@Ag NPs核壳结构，并将其附着在TiO2电极上，以其为传感平台实现有机磷农药残留的PEC检测。具体工作如下：制备Au@Ag NPs/TiO2 NRs PEC生物传感平台。由于胶体具有吸附性，实现了在Au NPs外层包裹一层Ag NPs，得到Au@Ag NPs核壳结构，并将得到的核壳结构附着在TiO2 NRs上，利用贵金属的局域表面等离子体共振效应（LSPR），增强TiO2 NRs在可见光区的PEC响应，制备光电性能优良的PEC生物传感平台。AChE作为神经传导过程中的一种重要的酶，可以催化硫代乙酰胆碱生成硫代胆碱，而硫代胆碱极易被空穴氧化形成具有电活性的二聚体，从而实现电信号的增强；而有机磷农药会抑制AChE的活性，导致体系的光电流下降。将此过程与制备的Au@Ag NPs/TiO2 NRs PEC生物传感平台相结合，建立有机磷农药残留检测新方法。
PHOTOCHEMICAL ORGANOPHOSPHORUS PESTICIDE DETECTION STUDY BASED ON PRECIOUS METALSEMICONDUCTOR HETEROGENEO *51今日免费论文网|www.51jrft.com +Q: #351916072# 
US JUNCTION
ABSTRACT
As an emerging analytical technology, photoelectrochemical (PEC) biosensing is attracting a lot of attention. Since the excitation source (light) and the detection signal (current) are of different types, the background signal of the PEC biosensor is greatly reduced.The principle of the assay is that the biospecific recognition interaction between the biospecific recognition element and the corresponding target causes a change in the signal generated by the photosensitive nanomaterial under the excitation of incident light.Based on this, in this paper, we designedAu@Ag NPs nuclear shell structures and attach them to TiO2 nanorods (TiO2 NRs), which are used as sensing platformfor organophosphorus pesticide residue detection. Including: Preparation of Au@Ag NPs/TiO2 NRs PEC platform. Due to the adsorption properties of the colloid, a layer of Ag NPs wrapped around the outer layer of Au NPs was achieved, and a nuclear shell structure of Au@Ag NPs was obtained. And the obtained nuclear shell structures are attached to TiO2 NRs to enhance the PEC signal of TiO2 NRs under visible light. Measurement of enzyme activity/inhibitor concentration by enzymecatalyzed generation of electron donor/receptor and enhancement of electrical signal. For example, AChE, as an important enzyme in nerve conduction process, can catalyze the generation of thiocholine by thiolylcholine, which is highly susceptible to cavitation oxidation to form electrically active dimer, thus achieving the enhancement of electrical signal, while organophosphorus pesticides can inhibit the activity of AChE, resulting in a decrease in the photocurrent of the system. Based on this, new methods of organophosphorus pesticide residue analysis are being explored.

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