The impact of surface Cu²⁺ of ZnO/(Cu_1−xZn_x)O heterostructured nanowires on the adsorption and chemical transformation of carbonyl compounds

Abstract

Unexpected features of surface Cu2+ on ZnO/(Cu1−xZnx)O nanowires for molecular transformation and electrical sensing of carbonyl compounds were found.

Water-Selective Nanostructured Dehumidifiers for Molecular Sensing Spaces

“…For this purpose, we employed the nanostructures composed of ZnO/TiO 2 /CaCl 2 core–shell heterostructured nanowires. The benefits of nanowire structures are an increase of surface area and also a spatial controllability of its crystal growth on a substrate. − The TiO 2 shell layer permanently retains the surface hydrophilicity to avoid detrimental aggregations of the hydrophilic CaCl 2 thin layer . The effect of such a surface hydrophilicity will be discussed in a later sectionFigure .…”

Oxide nanowire microfluidics addressing previously-unattainable analytical methods for biomolecules towards liquid biopsy

“…Besides this device development study, another study of our recent studies demonstrated the impact of surface cation composition on the adsorption and chemical transformation of carbonyl compounds. 99 We demonstrated that the suppressed adsorption of nonanal was affected by the surfaceexposed Cu 2+ and the surface Cu/Zn ratio of ZnO/(Cu 1Àx Zn x )O heterostructure nanowires (Fig. 9).…”

“…There are no conflicts to declare. 99 (c and d) Five successive sensor responses to nonanal using the ZnO nanowire device and (Cu,Zn)O nanowire device, respectively. 99…”

“…Fig.9 (a and b) Schematic and SEM images of single nanowire sensor devices using the (a) ZnO nanowire and (b) (Cu,Zn)O nanowire 99. (c and d) Five successive sensor responses to nonanal using the ZnO nanowire device and (Cu,Zn)O nanowire device, respectively 99. …”

Mechanistic Approach for Long-Term Stability of a Polyethylene Glycol–Carbon Black Nanocomposite Sensor

“…Chemiresistive sensors, which transduce volatile molecules in surrounding environments into digital information, have recently gained increasing attention due to their ability to collect and monitor chemical information for various usages such as environmental monitoring, healthcare, food safety, and qualification of industrial fine products in upcoming Internet of Things (IoT) era. − Chemiresistive sensors are utilized as components of artificial olfaction system’s so-called electronic nose (e-nose), and the molecular sensing data collected through the multisensor array in e-nose are analyzed based on a pattern recognition technique by mimicking the biological olfaction system. , The goal in this field is to collect time-series molecular sensing data by using IoT devices and exploit them as chemical big data. , Therefore, development of a long-term stable and low-energy consumption chemiresistive sensor is a major challenge. Among various chemiresistive sensors, a polymer–carbon nanocomposite-based sensor is a promising candidate for e-nose due to its printability, variety of applicable polymer materials, and low operation temperature (usually at room temperature), , which are hardly attainable in conventional metal-oxide semiconductor sensors. − Previous studies have been mainly devoted to polymer design for detecting various analyte molecules. − However, the polymer–carbon nanocomposite sensors often suffer from degradation of sensing performance in an air environment. For example, Chiou et al reported that a polyethylene glycol/multiwalled carbon nanotube nanocomposite sensor exhibited degradation of sensing response to 46% of its initial value after 100 cycles of acetone sensing at 45 °C .…”