Recent advances in ZnO nanostructure as a gas‐sensing element for an acetone sensor: a short review

Abstract

Air pollution is a severe concern globally as it disturbs the health conditions of living beings and the environment because of the discharge of acetone molecules. Metal oxide semiconductor (MOS) nanomaterials are crucial for developing efficient sensors because of their outstanding chemical and physical properties, empowering the inclusive developments in gas sensor productivity. This review presents the ZnO nanostructure state of the art and notable growth, and their structural, morphological, electronic, optical, and acetone-sensing properties. The key parameters, such as response, gas detection limit, sensitivity, reproducibility, response and recovery time, selectivity, and stability of the acetone sensor, have been discussed. Furthermore, gas-sensing mechanism models based on MOS for acetone sensing are reported and discussed. Finally, future possibilities and challenges for MOS (ZnO)-based gas sensors for acetone detection have also been explored.

Back to the Basics: Probing the Role of Surfaces in the Experimentally Observed Morphological Evolution of ZnO

“…By using the values of , it is possible to predict the preferential crystal growth direction of ZnO. According to the literature [ 10 , 72 , 73 , 74 ], the growth of ZnO crystals along the direction is the most reported. Nonetheless, Cho et al observed that when the triethyl citrate is used as a surfactant, a lateral growth of each spine along the six symmetric directions can be noted [ 75 ].…”

Smart and intelligent optical materials for sensing applications

“…Mishra et al [25] briefly highlighted a gas sensor device made from metal oxide semiconductors (MOS), and described their morphologies, essential influencing parameters, gas-sensing procedure, structural, electronic, and optical properties. This review also explored the difficulties in acetone determination for MOS (ZnO)based gas sensors.…”

Enhanced acetone gas sensing performance of ZnO polyhedrons decorated with LaFeO3 nanoparticles

“…This data shows the resistance of the sensor when exposed to air. And then the lid of the test system is covered, and an equivalent volume of liquid for the concentration of the gas to be tested is calculated by equation (1) [31], and the required amount of liquid is injected into the heated platform of the gas test box using a micro syringe, and is made to become a gas by heating, and a fan system ensures that the gas is uniformly distributed inside the test box. The target gas comes into contact with the sensor and the element responds and is characterized by a change in resistance measured in the test system.…”

“…For n-type semiconductors, for reducing gases, the gas sensing response of the sensor is defined as ΔR/R g , where ΔR = R a -R g [32], and When the gas-sensitive semiconductor sensor begins to come into contact with the detected gas, the element begins to respond and this is indicated by a change in resistance measured in the test system. It takes time from the beginning of the element's response to the detected gas until the resistance has changed to a steady state value, which is defined as the time it takes for the resistance to reach 90% of its steady state value [31]. Similarly, the recovery time is the time it takes for the resistance of the element to recover to 90% of its original value after the measured gas has been released [31], and the shorter the response and recovery time, the better the performance of the semiconductor element.…”

“…It takes time from the beginning of the element's response to the detected gas until the resistance has changed to a steady state value, which is defined as the time it takes for the resistance to reach 90% of its steady state value [31]. Similarly, the recovery time is the time it takes for the resistance of the element to recover to 90% of its original value after the measured gas has been released [31], and the shorter the response and recovery time, the better the performance of the semiconductor element.…”