Cu₂O and rGO Hybridizing for Enhancement of Low-Concentration NO₂ Sensing at Room Temperature

Abstract

The spherelike Cu2O and the hybrids with reduced graphene oxide (rGO) have been synthesized successfully by a facile solution-based self-assembly method. The structure, morphology, composition, and specific surface area of composite were characterized by XRD, SEM, FTIR, XPS, and BET analysis, respectively. The gas-sensing properties to 1 ppm of NO2 at room temperature were also examined. The results indicated that the 1 wt % rGO/Cu2O composite not only exhibits 2.8 times higher response than that of pristine Cu2O and excellent selectivity but also owns rapid response and recovery at room temperature, indicating the composite is a promising sensing material for room temperature detection of low-concentration NO2. The enhanced sensing properties were discussed in detail, which can mainly be attributed to increased gas adsorption active sites and the fast carriers transport due to the incorporating of rGO.

A Copper-Based Biosensor for Dual-Mode Glucose Detection

“…X-ray photoelectron spectroscopy (XPS) analysis was employed to further characterize the surface composition of the obtained Cu 2 O NPs. The XPS survey is shown in Figure 1E and Figure 1F for the high-resolution XPS spectrum of Cu 2p and the binding energy at 932.01 and 951.93 eV corresponds to Cu 2p 3/2 and Cu 2p 1/2 , respectively, which are in good agreement with previous reports on Cu 2 O NPs ( Pan et al, 2018 ; Zhang et al, 2020 ).…”

Fe-Doped ZnO/Reduced Graphene Oxide Nanocomposite with Synergic Enhanced Gas Sensing Performance for the Effective Detection of Formaldehyde

“…Pan et al synthesized rGO–Cu 2 O nanocomposites by a facile solution-based self-assembly method. 15 The rGO/Cu 2 O composite with 1 wt % rGO exhibited excellent selectivity, rapid response and recovery time, and 2.8 times higher response than that of the pristine Cu 2 O, all of this at room temperature. The enhanced sensing behavior was attributed to the incorporation of rGO, which increased the gas adsorption active sites and allowed the fast transport of carriers.…”

Noninvasive Detection of Ammonia in the Breath of Hemodialysis Patients Using a Highly Sensitive Ammonia Sensor Based on a Polypyrrole/Sulfonated Graphene Nanocomposite

“… , The XRD patterns of RGO and SRGO revealed a rather broad (002) diffraction peak between 24 and 31° and a weak (100) band at 2θ = 50.8°, respectively (Figure S3b). , …”