Electrochemical Synthesis of Sensitive Layer of Polyaniline: Effects of Acid Doping on Ethylene Gas Sensing

Abstract:

Ethylene gas is released from plants as a hormone during a certain stage of life cycle and induces ripeness in fruits and blooming of flowers. The early detection and control amount of ethylene gas in storage can prevent wastage of the entire stock. The aims of this research were to fabricate ethylene sensor based on polyaniline (PANi) and to investigate the effect of acid doping on an improvement of its sensitivity. Electrochemically synthesized conductive layer of PANi was prepared via an in situ radical polymerization by repeating potential cycling in the range of -0.3 to 1.0 V relative to the silver reference electrode and platinum counter electrode. The PANi films were deposited on interdigitated electrode of gold substrate. These emeraldine bases of PANi were doped with five different acids doping (such as HCl, H2SO4, H3PO4, TSA, and DBSA) at particular concentration. The influences of types and amount of acid on the sensitivity of acid doping PANi on ethylene gas were investigated. The PANi-dope films were characterized by Fourier transform infrared spectroscopy (FT-IR) and UV-visible spectroscopy (UV-vis). The morphology of PANi film was investigated by scanning electron microscope (SEM). The magnitude sensing of doping PANi in terms of types and amount of acid against ethylene gas was presented. Introduction

• Periodical: Materials Science Forum (Volumes 654-656)
• Pages: 2285-2288
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.654-656.2285
• Online since: June 2010
• Authors: Prasit Pattananuwat, Duangdao Aht-Ong
• Keywords: Acid Doping, Cyclic Voltammetry (CV), Ethylene Sensor, Polyaniline (PANI)

References

[1] P. Pattananuwat, D. Aht-ong: Electrochemical Synthesis of Polyaniline as Ethylene Gas Sensor. Adv. Mat. Res. Vol. 93-94 (2010), pp.459-462.

DOI: 10.4028/www.scientific.net/amr.93-94.459

[2] A. Anjali, Milind. A.V. K: Polyaniline and its substituted derivatives as sensor for aliphatic alcohols. Sensors and Actuators B. Vol. 67 (2000), pp.173-1200 % Sensitivity Ethylene gas (ppm).

DOI: 10.1016/s0925-4005(00)00394-4

1M HCl.

1M H2SO4.

01M H3PO4.

05M TSA.

1M DBSA 0 5 10 15 20 25 30 35 40 10 20 50 100 200 % Sensitivity Ethylene gas (ppm).

1 M HCl.

1M H2SO4.

01M H3PO4.

075M TSA.

1M DBSA.