Facile synthesis of ZnO nano-structures: Morphology influence on electronic properties

Year 2020: A Snapshot of the Last Progress in Flexible Printed Gas Sensors

“…This result has been due to extreme low crystallite size of 5.5 nm at the temperature of firing of 650 • C [81,82]. For the other cited materials, ZnO, synthesized in different nanoforms (see Figure 6) has shown great ability to detect acetone at sup ppm level [83], WO 3 , also as solid solution (W,Sn)O 3 to detect NO 2 [84], TiO 2 as detector of VOCs for medical diagnosis [85].…”

“…2020, 10, x FOR PEER REVIEW 12 of 25 Figure 6. ZnO nanoforms tested toward acetone for breath gas analysis [83].…”

“…In a conducting polymer based chemoresistive gas sensor, a change of the target gas concentration results in a polymer conductivity variation. The most used conducting polymers, also in flexible printed gas sensor development [82,83], are polyaniline, polypyrrole, poly(3,4-ethylenedioxythiophene) (PEDOT), and PEDOT doped with polystyrene sulfonated acid (PEDOT/PSS) [40,49,52]. In [92] the characteristic of printing conducting polymers to chemical sensor is described in detail.…”

“…It is primarily used as a solvent, also at industrial level. It is a natural biomarker associated with some metabolic diseases, like the diabetes (few hundred of ppb in healthy people, more than 1 ppm in diabetic subjects) [83].…”

Growth and properties of ZnO nanorods by RF-sputtering for detection of toxic gases

“…The current paper aims to investigate the growth parameters of ZnO nanorods with Sn catalyzer on an insulating substrate (alumina), and to correlate the physical and morphological properties of the material with its functional properties. Among different gases that can be detected by ZnO gas sensor, [20][21][22] the current work focuses on dangerous or poisonous gases: H 2 is an explosive gas produced in industrial reactions, Dimethyl Methyl Phosphonate (DMMP) is a simulant of sarin nerve agent (concentration around ppm), NO 2 is an air-pollutant, H 2 S is toxic and bad tolerated due to rotten-egg smell, acetonitrile is a simulant for hydrogen cyanide compounds. since the temperature is higher than Sn melting point, it grows as droplets on the alumina substrate.…”