XPS and Kelvin probe studies of SnO2/RGO nanohybrids based NO2 sensors

Bhangare, Bhagyashri; Ramgir, Niranjan S.; Jagtap, Shweta; Debnath, A.K.; Muthe, K.P.; Terashima, Chiaki; Aswal, D. K.; Gosavi, Suresh; Fujishima, Akira

doi:10.1016/j.apsusc.2019.05.176

Cited by 94 publications

(27 citation statements)

References 53 publications

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“…The C1s peak ( Figure 5 D) was subdivided into three individual peaks after the fitting of the main peak. The peaks at 284, 285, and 288 eV were observed to correspond to C=C, C-OH, and O-C=O, respectively, as shown in a previous study [ 42 ]. These results reveal that the rGO had a residual oxygen group [ 40 ].…”

Section: Resultssupporting

confidence: 80%

One-Pot Synthesis of SnO2-rGO Nanocomposite for Enhanced Photocatalytic and Anticancer Activity

et al. 2022

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Metal oxide and graphene derivative-based nanocomposites (NCs) are attractive to the fields of environmental remediation, optics, and cancer therapy owing to their remarkable physicochemical characteristics. There is limited information on the environmental and biomedical applications of tin oxide-reduced graphene oxide nanocomposites (SnO2-rGO NCs). The goal of this work was to explore the photocatalytic activity and anticancer efficacy of SnO2-rGO NCs. Pure SnO2 NPs and SnO2-rGO NCs were prepared using the one-pot hydrothermal method. X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR), UV–Vis spectrometry, photoluminescence (PL), and Raman scattering microscopy were applied to characterize the synthesized samples. The crystallite size of the SnO2 NPs slightly increased after rGO doping. TEM and SEM images show that the SnO2 NPs were tightly anchored onto the rGO sheets. The XPS and EDX data confirmed the chemical state and elemental composition of the SnO2-rGO NCs. Optical data suggest that the bandgap energy of the SnO2-rGO NCs was slightly lower than for the pure SnO2 NPs. In comparison to pure SnO2 NPs, the intensity of the PL spectra of the SnO2-rGO NCs was lower, indicating the decrement of the recombination rate of the surfaces charges (e−/h+) after rGO doping. Hence, the degradation efficiency of methylene blue (MB) dye by SnO2-rGO NCs (93%) was almost 2-fold higher than for pure SnO2 NPs (54%). The anticancer efficacy of SnO2-rGO NCs was also almost 1.5-fold higher against human liver cancer (HepG2) and human lung cancer (A549) cells compared to the SnO2 NPs. This study suggests a unique method to improve the photocatalytic activity and anticancer efficacy of SnO2 NPs by fusion with graphene derivatives.

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Section: Resultssupporting

confidence: 80%

One-Pot Synthesis of SnO2-rGO Nanocomposite for Enhanced Photocatalytic and Anticancer Activity

et al. 2022

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“…The response time, t 50 , and recovery time, t 50 , are defined as the time interval required for 50% signal change in the full magnitude of the response factor in a sensing cycle . The response time and the recovery time are 54 and 26 s in the measurement of 40 ppm NO 2 , respectively (Figure c), which are comparable to or shorter than the other gas sensors. − …”

Section: Resultsmentioning

confidence: 92%

Hydrogel-Based Gas Sensors for NO₂ and NH₃

2020

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In this study, an innovative gas sensing mechanism, self-responsive sensing mechanism, has been detected in the supramolecular hydrogel-based sensors. The self-responsive ability of as-fabricated hydrogel-based sensors to the target gas (e.g., NO2, NH3, etc.) is determined by three synergetic supramolecular interactions, namely, hydrogen bonding, molecule crystallization, and electrostatic interactions existing in hydroxyls, poly(vinyl alcohol) (PVA) crystallization, and poly(ionic liquids) of the intrinsic hydrogel networks, respectively. On account of unique synergetic supramolecular interactions, the sensors not only exhibit a rapid, reversible, and reproducible response but also show good tensile and compressive properties and excellent recovery property. The results demonstrate the potential of the self-responsive sensing mechanism as a pathway to realize a new generation of highly responsive hydrogel-based gas sensors.

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“…Thus, the aggregation and restacking of MoS 2 nanoflowers are not conducive to improving gas adsorption. A possible reason for this behavior may be that the aggregation of MoS 2 nanoflowers weakens the supporting effect of the rGO nanosheets and reduces the probability of NO 2 gas adsorption on the heterogeneous interface between the MoS 2 nanoflowers and the rGO nanosheets, thereby causing a decrease in gas sensitivity [ 70 ]. Therefore, due to its highest response value, MoS 2 /rGO/GQDs-2 was selected to further study the gas-sensing performance.…”

Section: Resultsmentioning

confidence: 99%

Three-Dimensional MoS2/Reduced Graphene Oxide Nanosheets/Graphene Quantum Dots Hybrids for High-Performance Room-Temperature NO2 Gas Sensors

Cheng

Wang

et al. 2022

Nanomaterials

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This study presents three-dimensional (3D) MoS2/reduced graphene oxide (rGO)/graphene quantum dots (GQDs) hybrids with improved gas sensing performance for NO2 sensors. GQDs were introduced to prevent the agglomeration of nanosheets during mixing of rGO and MoS2. The resultant MoS2/rGO/GQDs hybrids exhibit a well-defined 3D nanostructure, with a firm connection among components. The prepared MoS2/rGO/GQDs-based sensor exhibits a response of 23.2% toward 50 ppm NO2 at room temperature. Furthermore, when exposed to NO2 gas with a concentration as low as 5 ppm, the prepared sensor retains a response of 15.2%. Compared with the MoS2/rGO nanocomposites, the addition of GQDs improves the sensitivity to 21.1% and 23.2% when the sensor is exposed to 30 and 50 ppm NO2 gas, respectively. Additionally, the MoS2/rGO/GQDs-based sensor exhibits outstanding repeatability and gas selectivity. When exposed to certain typical interference gases, the MoS2/rGO/GQDs-based sensor has over 10 times higher sensitivity toward NO2 than the other gases. This study indicates that MoS2/rGO/GQDs hybrids are potential candidates for the development of NO2 sensors with excellent gas sensitivity.

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XPS and Kelvin probe studies of SnO2/RGO nanohybrids based NO2 sensors

Cited by 94 publications

References 53 publications

One-Pot Synthesis of SnO2-rGO Nanocomposite for Enhanced Photocatalytic and Anticancer Activity

One-Pot Synthesis of SnO2-rGO Nanocomposite for Enhanced Photocatalytic and Anticancer Activity

Hydrogel-Based Gas Sensors for NO₂ and NH₃

Three-Dimensional MoS2/Reduced Graphene Oxide Nanosheets/Graphene Quantum Dots Hybrids for High-Performance Room-Temperature NO2 Gas Sensors

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XPS and Kelvin probe studies of SnO2/RGO nanohybrids based NO2 sensors

Cited by 94 publications

References 53 publications

One-Pot Synthesis of SnO2-rGO Nanocomposite for Enhanced Photocatalytic and Anticancer Activity

One-Pot Synthesis of SnO2-rGO Nanocomposite for Enhanced Photocatalytic and Anticancer Activity

Hydrogel-Based Gas Sensors for NO2 and NH3

Three-Dimensional MoS2/Reduced Graphene Oxide Nanosheets/Graphene Quantum Dots Hybrids for High-Performance Room-Temperature NO2 Gas Sensors

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Hydrogel-Based Gas Sensors for NO₂ and NH₃