A photoelectrochemical sensor for ultrasensitive dopamine detection based on single-layer NanoMoS<inf>2</inf>modified gold electrode

发布时间：2023-10-19 点击次数：

• 关键字：Photoelectrochemical cells;Amines - Electrochemistry - Electrodes - Gold - Neurophysiology - Photocurrents - Sensors;Dopamine - Dopamine concentrations - Gold electrodes - Nanomos - Photoactive materials - Photoelectrochemical sensors - Photoelectrochemicals - Small molecule detections
• 摘要：Photoactive material is a crucial factor which affects the sensitivity and selectivity of the photoelectrochemical (PEC) sensor. A simple PEC sensing platform was fabricated using nanoMoS<inf>2</inf>modified gold electrode (nanoMoS<inf>2</inf>/GE) in this paper. Three kinds of nanoMoS<inf>2</inf>, single-layer nanoMoS<inf>2</inf>, multiple-layers nanoMoS<inf>2</inf>and small-sized nanoMoS<inf>2</inf>, were used to modify the electrode. It was found that the single-layer nanoMoS<inf>2</inf>showed utmost PEC response. The photocurrent of nanoMoS<inf>2</inf>/GE was drastically improved upon the addition of dopamine, which was attributed to the life improvement of the electron-hole pairs. Based on the enhanced photocurrent signal, a PEC methodology for ultrasensitive determination of dopamine has been developed, which showed linearly enhanced photocurrent by increasing the dopamine concentration from 1.0&nbsp;&times;&nbsp;10^&minus;11&nbsp;M to 1.0&nbsp;&times;&nbsp;10^&minus;5&nbsp;M with a detection limit of 2.3&nbsp;&times;&nbsp;10^&minus;12&nbsp;M and the RSD was 3.9% at 2.0&nbsp;&times;&nbsp;10^&minus;10&nbsp;M (n&nbsp;=&nbsp;9) under optimal conditions. This method showed high sensitivity, simplicity and wide linearity range which opened up a new promising signal-on PEC platform for small molecule detection in bioanalysis. &copy; 2017
• 卷号：249
• 期号：
• 是否译文：否