Portable room-temperature self-powered/active H2 sensor driven by human motion through piezoelectric screening effect

Abstract Room-temperature high H 2 sensing has been realized from SnO 2 /ZnO nanoarray nanogenerator.Without any external electricity power source, the portable device can be self-powered underthe driving of human motion, in which the piezoelectric output can actively act as both thepower source and H 2 sensing signal. Upon exposure to 800 ppm H 2 at room temperature, thepiezoelectric output voltage of the device under the same applied deformation decreases from0.80 V (in dry air) to 0.14 V, and the sensitivity is up to 471.4. The detection limit is 10 ppmH 2 , and the selectivity against H 2 at room temperature is very high. The excellent room-temperature H 2 sensing performance can be attributed to the coupling of the piezoelectricscreening effect of ZnO nanowires and the conversion of SnO 2 /ZnO heterojunctions. This studycan stimulate a research trend for the development of the next generation of portable room-temperature H 2 sensors.& 2014 Elsevier Ltd. All rights reserved. 1. Introduction

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