Morphology-Dependent Gas Sensing Properties of CuO Microstructures Self-Assembled from Nanorods

Copper-based metal oxides for chemiresistive gas sensors

“…as a solvent. 19,76,77 The final morphology of metal oxides during the synthesis is generally affected by the following factors: (i) the type of solvent, (ii) the reaction temperature, [611] (iii) the hydrothermal time, 60,64 (iv) the concentration of copper salt, 78 and (v) the type of shape directing agent. 79 To investigate the influence of the reaction temperature and the solvent types on the morphology of sensitive materials, Bhuvaneshwari et al 61 have developed 3-dimensional (3D) CuO superstructures under different reaction conditions, as given in Fig.…”

“…3d), the CuO superstructure shows an urchin sphere-like morphology, which is mainly attributed to the faster nucleation and growth. Geng et al 60 studied the effect of additives and hydrothermal time on the morphology of the CuO microstructure. At the initial stage of 2 h, the particles aggregated to form nanorods with a diameter of 25-50 nm.…”

“…Based on the composition of a sensing material, its gas sensing characteristics largely depend on its morphology, which has been verified by many researchers. [58][59][60][61] Therefore, a variety of synthesis strategies have been reported for preparing materials with a unique morphology that can provide a large specific surface area and high porosity. The methods utilized in the synthesis of CuO/Cu 2 O mainly include the co-precipitation method, 59,62 hydrothermal method, 61,63 template method, 58,64,65 electrospinning method, 66 g-ray radiolysis, 67 etc, wherein, the first three methods are based on the bottom-up approach, and areconsidered as the most commonly used route because of their simplicity and low cost.…”

A review on the synthesis and applications of sustainable copper-based nanomaterials

“…In recent years, researchers have mainly focused on the development of sensitive and stable gas sensors, given that an enormous amount of polluting gases is produced in fastgrowing industries and vehicles, leading to serious problems for human health and the environment. 408,409 Due to their colourless and odourless nature, most gases are inhaled by people without their knowledge, causing serious health problems and even death. Long-term exposure to NO 2 , H 2 S, CO and SO 2 gases at low concentrations can seriously damage the respiratory system and cause headaches, dizziness and eye and nose irritation.…”

CuO/PMMA Polymer Nanocomposites as Novel Resist Materials for E-Beam Lithography

“…Physical mixing of CuO nanofillers with the polymer host has also been reported in other works [ 22 , 23 , 24 ], but in all cases, the films were merely formed by drop-casting and lithographic patterning was not attempted. CuO was selected as the nanofiller as it has been proven to be one of the most promising and versatile metal oxides exhibiting a remarkable spectrum of properties, such as catalytic activity [ 25 ], energy storage capabilities [ 26 ], optoelectronic [ 27 , 28 ] and antibacterial properties [ 29 ], and most notably gas sensing properties [ 30 , 31 , 32 ]. This work was mainly devised with the latter in mind so as to create a novel CuO/PMMA resist material readily applicable for the development of polymer-based novel gas sensors [ 24 , 33 ].…”