Magnesium oxide nanocubes deposited on an overhead projector sheet: synthesis and resistivity-based hydrogen sensing capability

Advanced development of metal oxide nanomaterials for H2gas sensing applications

“…Pradeep et al 155 43 In addition, the thermal evaporation method is to vaporize precursors in noble gases (or reactive gases) and then form a thin film by collision, cooling, and condensation process. According to the precursors used in the preparation process, the thermal evaporation method can be generally divided into direct evaporation of MOx powder, pure metal powder thermal evaporation, and decomposition of MOx etc.…”

Enzyme Free Detection of Glucose Using MgO Nanocubes Based Extended Gate N-channel MOSFET

“…Preparation technique were as per the previously reported literature [16]. MgO nanocubes were prepared by thermal CVD approach from magnesium powder under controlled conditions without a gold catalyst.…”

Design and Verification of Humidity Sensors Based on Magnesium Oxide Micro-Arc Oxidation Film Layers

“…MgO is a p-type semiconductor, which has a larger band gap (7.8 eV) than other metal oxides. Since the surface positive ions (Mg 2+ ) had greater electron affinity than the internal positive ions, the surface acceptor level occurred slightly below the conduction band bottom [35]. The negative ion (0 2− ) on the surface had greater electron repellency than the internal negative ion, so the surface donor level appeared slightly above the valence band.…”

“…The originally trapped holes were released, while the carrier concentration rose, showing a decrease in resistance [37]. At the same time, compared with other metal oxides, MgO had faster carrier mobility [19,35], which made the film impedance decrease rapidly with increasing humidity at the low relative humidity, showing rapid response. However, with the increase of humidity, it had been confirmed that the thickness of the water film was as high as several tens of water molecules in the case of high humidity, and when the physically adsorbed water molecules could not continue to form an additional donor (acceptor) state, that is, in a high humidity environment, the impedance of the micro-arc MgO did not continue to change significantly with the increase of the relative humidity [38].…”