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An ultra-sensitive piezoresistive polymer nano-composite microcantilever platform for humidity and soil moisture detection

DSpace at IIT Bombay

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Title An ultra-sensitive piezoresistive polymer nano-composite microcantilever platform for humidity and soil moisture detection
 
Creator PATIL, SJ
ADHIKARI, A
BAGHINI, MS
RAO, VR
 
Subject SU-8/carbon black nano-composite
Microcantilevers
Poly-aniline nanofibers
Relative humidity and soil moisture
SENSORS
POLYANILINE
MEMS
TEMPERATURE
CANTILEVERS
MECHANISM
FILMS
 
Description Simultaneous monitoring of soil moisture at different soil levels or near plant roots and relative humidity are crucial for optimizing the crop yield. In the present paper, we demonstrate a novel, compact and inexpensive polymer nano-composite piezoresistive microcantilever sensor platform for the measurement of relative humidity (% RH) and soil moisture. A piezoresistive microcantilever is realized using SU-8 and carbon black based nano-composite. Its surface is further modified by Poly-aniline (PANI) nanofibers as a sensing layer. The surface functionalization is confirmed by FTIR, SEM and contact angle measurements. The sensor exhibited a maximum response of 28 mV toward 93% RH with sensitivity of 64 mu V/0.1% RH. Sensitivity values of 43.6, 275 and 78.6 mu V/0.1% change in the moisture content for bentonite soil, white clay and sand, respectively, are achieved. Such high sensitivity values coupled with the low cost can be utilized further for the realization of rugged, portable and handeld devices with wireless networking facility. (C) 2014 Elsevier B. V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2014-12-29T05:16:12Z
2014-12-29T05:16:12Z
2014
 
Type Article
 
Identifier SENSORS AND ACTUATORS B-CHEMICAL, 203165-173
0925-4005
http://dx.doi.org/10.1016/j.snb.2014.06.110
http://dspace.library.iitb.ac.in/jspui/handle/100/17170
 
Language English