Open AccessA comparative study on the VOCs sensing behaviors of various ZnO nanostructures
Author(s) -
Nguyen Minh Vuong,
Dinh Tien Dung,
Hoang Nhat Hieu,
Nguyễn Văn Nghĩa,
Nguyễn Ngọc Khoa Trường,
Le Thi Ngoc Loan,
Thanh Hai Phan
Publication year - 2020
Publication title -
vietnam journal of catalysis and adsorption
Language(s) - English
Resource type - Journals
ISSN - 0866-7411
DOI - 10.51316/jca.2020.080
Subject(s) - nanorod , materials science , nanostructure , hydrothermal circulation , scanning electron microscope , nanomaterials , nanoparticle , nanotechnology , transmission electron microscopy , chemical engineering , acetone , layer (electronics) , methanol , composite material , chemistry , organic chemistry , engineering
The volatile organic compounds (VOCs) sensing layers were studied using ZnO nanomaterials with different morphologies including hierarchical nanostructure (ZnO-H), nanorods (ZnO-NRs), commercial nanoparticles (ZnO-CNPs) and wet chemical synthesized nanoparticles (ZnO-HNPs). ZnO hierarchical structure was fabricated by an electrospinning technique followed by hydrothermal process. ZnO vertical nanorods structure was fabricated by hydrothermal method, while ZnO nanoparticles based sensors were prepared from commercial powder and wet chemical method. The morphology and properties of the fabricated samples were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). VOCs sensing responses toward acetone, ethanol and methanol with respect to altered ZnO nanostructureswas systematically compared at different working temperatures. The enhanced response at low working temperatures induced by theopen space hierarchical structure was observed. The VOCs sensing mechanisms of the ZnO nanostructures based sensing layer were also explained and discussed in detail.