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An excellent humidity sensor based on In–SnO2 loaded mesoporous graphitic carbon nitride

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Abstract

A highly sensitive and fast responsive relative humidity (% RH) sensor based on In–SnO2 loaded cubic mesoporous graphitic carbon nitride (g-C3N4) has been demonstrated in this study. The mesoporous In–SnO2/meso-CN nanohybrid was synthesized through template inversion of mesoporous silica, KIT-6, using a nanocasting process. Due to its 3D replicated cubic structure with ordered mesopores, the nanohybrid facilitates the process of adsorption, charge transmission and desorption of water molecules across the sensor surfaces. Consequently, the optimized In–SnO2/meso-CN nanohybrid exhibits excellent response (5 orders change in impedance) in the 11–98% RH range, high stability, negligible hysteresis (0.7%) and superior real time % RH detection performance. Compared to traditional metal oxide based resistive sensors with unique mesoporous/hierarchical/sheet-like morphology, the 3D mesostructured In–SnO2/meso-CN nanohybrid demonstrated a superfast response (3.5 s) and recovery (1.5 s) in the 11–98% RH range at room temperature. These results open the door for breath monitoring and show a promising glimpse for designing mesoporous 2D layered materials in the development of future ultra-sensitive % RH sensors.

Graphical abstract: An excellent humidity sensor based on In–SnO2 loaded mesoporous graphitic carbon nitride

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Publication details

The article was received on 02 Apr 2017, accepted on 04 Jun 2017 and first published on 05 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA02860A
Citation: J. Mater. Chem. A, 2017, Advance Article
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    An excellent humidity sensor based on In–SnO2 loaded mesoporous graphitic carbon nitride

    R. Malik, V. K. Tomer, V. Chaudhary, M. S. Dahiya, A. Sharma, S. P. Nehra, S. Duhan and K. Kailasam, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA02860A

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