Jump to main content
Jump to site search

Issue 48, 2019
Previous Article Next Article

Fabrication of rGO nano-sheets wrapped on Ni doped ZnO nanowire p–n heterostructures for hydrogen gas sensing

Author affiliations

Abstract

In this work, two types of van der Waals p–n heterostructure nanocomposite materials (nano-sheet/nanowire) are fabricated, and their gas sensing performances are analyzed. A hydrothermal process and Hummers' method are used for nanowire (NW) growth (Ni doped ZnO (Ni–ZnO-NWs) and ZnO (ZnO-NWs)), and rGO nano-sheet (rGO-NS) synthesis, respectively. Then, (1) rGO-NSs + Ni–ZnO-NWs (Ni–ZnO–rGO) and (2) rGO-NSs + ZnO-NWs (ZnO–rGO), as nanocomposite materials, and (3) Ni–ZnO-NWs, (4) ZnO-NWs, and (5) rGO-NSs as pristine materials are electro-sprayed on interdigitated electrodes to study their gas sensing performances. Characterization of the (1) and (2) materials shows that the nanowires are wrapped by nano-sheets. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX), elemental mapping by EDX spectroscopy and X-ray photoelectron spectroscopy (XPS) are used for structural, morphological, and material characterization. Different concentrations of rGO (0.8 wt%, 1.2 wt%, 1.6 wt%, and 2 wt%) in the ZnO–rGO and Ni–ZnO–rGO nanocomposites are also studied, and the gas-sensing responses of Ni–ZnO–rGO and ZnO–rGO with 1.6 wt% rGO concentration are 29.9% and 16%, respectively, toward 50 ppm of hydrogen gas at 150 °C. Subsequently, response/recovery times are analyzed in various concentrations of gases at different temperatures. Also, gas sensing selectivity toward ethanol, nitrogen dioxide and ammonia gases is studied.

Graphical abstract: Fabrication of rGO nano-sheets wrapped on Ni doped ZnO nanowire p–n heterostructures for hydrogen gas sensing

Back to tab navigation

Article information


Submitted
12 Oct 2019
Accepted
12 Nov 2019
First published
14 Nov 2019

New J. Chem., 2019,43, 19253-19264
Article type
Paper

Fabrication of rGO nano-sheets wrapped on Ni doped ZnO nanowire p–n heterostructures for hydrogen gas sensing

H. Abdollahi, M. Samkan and M. M. Hashemi, New J. Chem., 2019, 43, 19253
DOI: 10.1039/C9NJ05152J

Social activity

Search articles by author

Spotlight

Advertisements