Title :
Study on Effect of [OH−] Linkages on Physical, Electrical, and Gas Sensing Properties of ZnO Nanoparticles
Author :
Jagtap, Shweta ; Priolkar, Kaustubh
Author_Institution :
Dept. of Phys., Goa Univ., Panaji, India
Abstract :
This paper reports the growth mechanism of sol-gel derived nanocrystalline ZnO powder. The influence of pH value on the particle size and its properties are studied using X-ray diffraction, UV, Fourier transform infrared spectroscopy, photoluminescence (PL), and impedance spectroscopy. UV analysis reveals an increase in bandgap due to decrease in particle size. The strong UV emission along with some defect sites is also observed from PL spectra. The presence of Zn-OH linkages are observed in the case of ZnO with lower pH values (pH 7, 8, and 9) which are responsible for lower sensitivity toward volatile organic compounds. However, higher pH values (pH 10 and 11) have absence of Zn-OH linkage, which improves the gas sensing performance.
Keywords :
Fourier transform infrared spectra; II-VI semiconductors; X-ray diffraction; energy gap; gas sensors; nanofabrication; nanoparticles; nanosensors; organic compounds; particle size; photoluminescence; powders; semiconductor growth; sol-gel processing; ultraviolet spectra; wide band gap semiconductors; zinc compounds; FTIR; Fourier transform infrared spectroscopy; UV emission; UV spectroscopy; X-ray diffraction; XRD; Zn-OH linkages; ZnO; ZnO nanoparticles; bandgap; defect sites; electrical properties; gas sensing properties; growth mechanism; impedance spectroscopy; linkage effect; particle size; photoluminescence spectra; physical properties; sol-gel derived nanocrystalline ZnO powder; volatile organic compounds; Absorption; Ions; Nanoparticles; Powders; Sensors; X-ray scattering; Zinc oxide; VOCs; ZnO; nanoparticles; pH; sensor response;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2015.2426681
