The exceptional adsorption ability and gas-detection sensitivity of Cu₂O with tunable morphologies

Abstract

The systematic and delicate geometry control of Cu 2 O nanostructures with different size can be achieved by simply tuning the dropping speed of NH 2 OH HCl, the volume of solvent and the concentration of NaOH.All the Cu 2 O nanocrystals exhibit better adsorption ability than granular active carbon on MO (methyl orange), and the hollow sphere Cu 2 O shows the best adsorption performance, MO with a concentration of 15 mg L À1 is completely absorbed by the hollow sphere Cu 2 O in 5 min. The gas detection sensitivity is also investigated and the hollow sphere structures exhibit the best gas-sensing response, and more importantly, at low temperature and even ppb level it also exhibits a remarkably high response, fast response, recovery time and good stability.

A Room Temperature High‐Performance Visible‐Light‐Assisted NO2 Gas Sensor Based on Ultrathin Zinc Oxysulfide

“…The gas sensing performance is assessed as a response factor based on Equation (), where R g denotes the sensor's electrical resistance with the exposure of the analyte gas species, whereas R a represents its base resistance in the air. [ 13,59 ] $$$$\begin{equation}{\mathrm{Response}}\,{\mathrm{Factor}} = {R}_{\mathrm{g}}{\mathrm{/}}{R}_{\mathrm{a}}\end{equation}$$$$…”

“…The gas sensing performance is assessed as a response factor based on Equation (1), where R g denotes the sensor's electrical resistance with the exposure of the analyte gas species, whereas R a represents its base resistance in the air. [13,59] Response Factor = R g ∕R a (1)…”

Design, Synthesis, and Diverse Applications of Cu-Based Photocatalysts: A Review

“…Its essence is to control the pH value of the system through NH 2 OH·HCl, so as to affect the morphology of the crystal. The increase of the NH 2 OH·HCl concentration is more likely to induce the growth of Cu 2 O along the {111} direction and evolution into a truncated octahedral structure, while the lower concentration is conducive to the growth of Cu 2 O along the {100} direction and eventually evolution into a cubic structure …”

“…The increase of the NH 2 OH•HCl concentration is more likely to induce the growth of Cu 2 O along the {111} direction and evolution into a truncated octahedral structure, while the lower concentration is conducive to the growth of Cu 2 O along the {100} direction and eventually evolution into a cubic structure. 74 All the above prepared Cu 2 O nanocrystals have good crystallinity and complete morphology, and the size ranged from 100 to 1000 nm. This means that for a given mass, they have a lower specific surface area, which may directly contribute to a reduction in their active sites.…”

Unique Photoactivated Time‐Resolved Response in 2D GeS for Selective Detection of Volatile Organic Compounds

“…In recent years, studies have shown that the dynamic response contains valuable information such as response time and recovery time that may not be available in static measurements. [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ] Herein, for the first time, we demonstrate a new technique to produce a unique time‐resolved electrical response to different VOCs. Mechanically exfoliated 2D GeS crystal electrically contacted by interdigitated Cr/Au electrodes exhibited a unique time‐resolved electrical response to six different VOCs measured assisted by UV photoexcitation.…”