Single-wall carbon nanotube-based voltammetric sensor and biosensor

The pH-sensitive property of the single-wall carbon nanotube modified electrode based oil the electroactive group on the single-wall carbon nanotube was explored by differential pulse voltammetry technique. In pH range 1-13 investigated in Britton-Robinson (B-R) buffer, the anodic peak shifted negatively along with the increase of pH exhibiting a reversible Nernstian response. Experiments were carried out to investigate the response of the single-wall carbon nanotube (SWNT) modified electrode to analytes associated with pH change. The response behavior of the modified electrode to ammonia was studied as an example. The potential response could reach equilibrium within 5 min. The modified electrode had good operational stability. Voltammetric urease and acetylcholinesterase biosensors were constructed by immobilizing the enzymes with sol-get hybrid material. The maximum potential shift could reach 0.130 and 0.220V for urea and acetylthiocholine, respectively. The methods for preparing sensor and biosensor were simple and reproducible and the range of analytes could be extended to substrates of other hydrolyases and esterases.

化学传感器与催化

本文从化学传感器与催化之关连的角度论述了两学科共通的几个重要问题及其相互关系,诸如气体在固体表面上的吸附与反应行为,贵金属添加剂的作用,固体表面的改性及精细结构的控制等。前言众所周知,所谓化学传感器就是检知化学成分并获得电信号或光信号的装置。这里,化学传感器必须具备两项功能:一是对化学成分存在与否的检知功能(receptor),二是检知后转换为电信号的传感功能(transducer)。这其中利用了很多化学现象与材料物性,