Au Decorated ZnO hierarchical architectures: Facile synthesis, tunable morphology and enhanced CO detection at room temperature

One Pot Synthesis of Au_ZnO Core‐Shell Nanoparticles Using a Zn Complex Acting as ZnO Precursor, Capping and Reducing Agent During the Formation of Au NPs

“…The XPS Zn 2p features (Figure ) consist of the main 2p 3/2 , 2p 1/2 spin‐orbit components at 1023.1 and 1046.5 eV, respectively . These values are somewhat larger (≈ 1 eV) than others already reported for pure ZnO materials, but almost identical to those already reported for Au decorated ZnO hierarchical architectures . This observation can be simply related to the significant difference in electronegativity of the two elements being that of zinc 1.65 and that of gold 2.54.…”

“…Also the optical properties of core‐shell nanoparticles consisting of ZnO shells grown on Ag and Au nanoparticle cores, by a solution method, have been investigated . Many other reports have highlighted the properties of the Au_ZnO system as tunable photodetector, catalyst and photocatalyst, field‐effect transistor, photoluminescent material, material for water splitting, for third order nonlinear optical properties, as diode for inverse I–V injection, for selective bio‐capture, for CO detection at room temperature, etc …”

Advances in designs and mechanisms of semiconducting metal oxide nanostructures for high-precision gas sensors operated at room temperature

“…112 The aim of this topical review is to critically evaluate the design and structure of SMON-based gas sensors that may help guide the design of new devices. The performance of these SMON based gas sensors operated at RT could be improved significantly by modifying the SMONs using noble metal nanoparticles, [113][114][115][116] metal ions, [117][118][119] composites of multiple SMONs [120][121][122][123] and carbon nanomaterials. [124][125][126] In addition, not only the quantity of chemisorbed oxygen species, 127 defects 128 and element compositions 129,130 on the surface of SMONs, but also the structural properties, i.e., porosity, 131 heterojunction properties [132][133][134] and conductivity 135,136 can affect the RT gas sensing performance.…”

“…However, this problem might be solved by modifying the surface of these SMONs using noble metal nanoparticles. For example, Arunkumar et al 113 prepared ZnO nanostar features using a hydrothermal route and then decorated these nanostars using Au nanoparticles with an average size of B5-6 nm as shown in Fig. 14a.…”

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

“…Prolonged exposure to concentrations higher than 50-70 ppm of CO may cause death [13]. Many different nanostructures based on pure and doped ZnO have been investigated as sensitive materials for CO monitoring [13,[76][77][78]. Despite this, only a few studies have reported the use of 2D ZnO as a CO sensor.…”