Disposable paper-based electrochemical sensor utilizing inkjet-printed Polyaniline modified screen-printed carbon electrode for Ascorbic acid detection
Disposable paper-based electrochemical sensor utilizing inkjet-printed Polyaniline modified screen-printed carbon electrode for Ascorbic acid detection
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DOI：
10.1016/j.jelechem.2012.08.039
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发表时间：
2012-10-01
影响因子：
4.5
通讯作者：
Pimpin, Alongkorn
中科院分区：
文献类型：
--
作者：
Kit-Anan, Worrapong;Olarnwanich, Aricha;Pimpin, Alongkorn
在这项工作中，开发了一种新型纸基电化学传感器，作为一种用于预筛选目的的低成本一次性即时检测设备。这种新型传感器的电极采用两种印刷技术制造，即对基底材料进行丝网印刷以及对功能材料进行喷墨印刷，并展示了所制造的传感器用于抗坏血酸检测的性能。纸基器件由三个电极组成，包括聚苯胺（PANI）修饰的丝网印刷碳电极（SPCE）作为工作电极，以及两个裸SPCE分别作为参比电极和对电极。首先在滤纸上丝网印刷三个SPCE，然后在指定的工作SPCE上连续喷墨印刷PANI。使用循环伏安法（CV），通过改变醋酸盐缓冲液的pH值以及印刷的PANI层数，系统地研究了其对抗坏血酸的电化学性能。CV结果表明，最佳缓冲液pH值和PANI层数分别为4.0 - 5.0和5。因此，在先前CV研究得出的最佳条件下，使用计时电流法技术进行抗坏血酸浓度的实时检测。结果显示，在30 - 270 μM的浓度范围内，该传感器表现出17.7 μA/mM的良好灵敏度以及30 ± 3 μM的适度低检测限。从成本与性能的角度来看，使用带有喷墨印刷PANI修饰的SPCE的纸基传感器是低成本一次性即时检测应用的一种替代选择。（C）2012爱思唯尔公司。版权所有。
In this work, a new paper-based electrochemical sensor is developed as a low-cost and disposable point-of-care device for pre-screening purpose. Electrodes of this new sensor are fabricated using two printing techniques, i.e. screen-printing for base material and inkier-printing for modifying functional material, and the performance of fabricated sensors for Ascorbic acid detection is demonstrated. The paper-based device consists of three electrodes including Polyaniline (PANI) modified Screen-Printed Carbon Electrode (SPCE) as working electrode and two bare SPCEs as reference and counter electrodes. Three SPCEs are initially screen-printed on a filter paper, and PANI is consecutively inkjet-printed on the designated working SPCE. Its electrochemical performances are systematically investigated towards Ascorbic acid using Cyclic Voltammetry (CV) with different Acetate buffer pHs and numbers of printed-PANI layers. The CV results show that the optimal buffer pH and number of PANI layers are 4.0-5.0 and 5, respectively. Consequently, real-time detection of Ascorbic acid concentration is performed using Chronoamperometry technique under the optimal conditions from previous CV studies. From the results, the sensor exhibits a good sensitivity of 17.7 mu A/mM and a moderately low limit-of-detection of 30 +/- 3 mu M in a concentration range of 30-270 mu M. According to cost versus performance, the utilization of paper-based sensor with inkjet-printed PANI modified SCPE is an alternative choice for low-cost and disposable point-of-care applications. (C) 2012 Elsevier B.V. All rights reserved.