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A novel electro-colorimetric gas sensing technique based on the catalytic metal nanoparticles decorated metal oxide nanostructures integrated with multiple quantum wells (MQWs) has been proposed. The working principle has been demonstrated by the sensing device derived from the composite consisting of In0.15Ga0.85N/GaN MQWs and Pt-functionalized In2O3 nanopushpins for the detection of hydrogen gas. The pronounced changes in emission as well as Raman scattering spectra of InGaN/GaN MQWs under different target gas concentrations clearly illustrate the feasibility of our newly designed composites for the derivative of contact-free, simple and highly sensitive gas sensors with optical detection
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Chen et al. (2012) studied this question.
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