Open AccessQuartz crystal microbalance sensor for NO2 detection based on electrospun amorphous titanium oxide fibers
Author(s) -
K. Starbova,
В. Георгиева,
N. Starbov,
P Stefanov,
Biliana Georgieva,
J Lazarov
Publication year - 2022
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2240/1/012017
Subject(s) - quartz crystal microbalance , high resolution transmission electron microscopy , x ray photoelectron spectroscopy , amorphous solid , materials science , titanium , titanium oxide , transmission electron microscopy , chemical engineering , scanning electron microscope , titanium dioxide , sorption , analytical chemistry (journal) , oxide , crystal (programming language) , nanotechnology , chemistry , adsorption , composite material , crystallography , chromatography , organic chemistry , programming language , computer science , engineering , metallurgy
The sensitivity to various concentrations of NO 2 is studied of a 16-MHz quartz crystal microbalance (QCMs) coated by immobilized electrospun amorphous titanium oxide fibers. The morphology, phase and chemical composition of the sensing material are determined by scanning and high-resolution transmission electron microscopy (SEM, HRTEM), transmission high-energy electron diffraction (THEED) and X-ray photoelectron spectroscopy (XPS). Resonance frequency shifts are established of the QCM-TiO 2 system within a broad interval of NO 2 concentrations. Experimental evidence is found for a reversible gas sorption at the lowest tested gas concentration of 50 ppm. Additional sensor response is established to gradually increasing NO 2 concentrations up to 5000 ppm. It is demonstrated that electrospun amorphous titanium oxide fibers are promising sensing materials for NO 2 detection.