Mesoporous Co3O4 nanosheets with exposed Co2+-rich crystal facets for improved toluene detection

Kong, Dehao; Zhou, Weirong; Han, Jiayin; Gao, Yubing; Gao, Yuan; Zhao, Lin; Sun, Peng; Lu, Geyu

doi:10.1016/j.apsusc.2023.156714

Cited by 13 publications

(4 citation statements)

References 42 publications

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“…The high-resolution O 1s spectra of pristine CdS and CG-5 are shown in Figure S3, only one oxygen contribution at 532 eV was observed in both samples, which can be attributed to chemisorbed oxygen on the material surface. 45 The oxygen atomic percentages of pristine CdS and CG-5 were found to be 8.34 and 9.14 at%, respectively. However, the increased oxygen content may originate from the additional adsorbed oxygen on the nanocomposite surface or it may be attributed to the residual oxygen in rGO.…”

Section: Resultsmentioning

confidence: 94%

“…The peak shifting toward the high energy direction caused by the strong interaction between CdS and rGO indicated that the electrons transferred from CdS to rGO, which demonstrated that local heterojunction existed at the interface of CdS and rGO. The high-resolution O 1s spectra of pristine CdS and CG-5 are shown in Figure S3, only one oxygen contribution at 532 eV was observed in both samples, which can be attributed to chemisorbed oxygen on the material surface . The oxygen atomic percentages of pristine CdS and CG-5 were found to be 8.34 and 9.14 at%, respectively.…”

Section: Resultsmentioning

confidence: 95%

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Moisture-Independent Detection of n-Propanol Using a Kinetic Gas Sensor Based on CdS Nanorods Coated with Reduced Graphene Oxide

Gao,

Zhou,

Kong

et al. 2023

ACS Appl. Nano Mater.

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In the era of intelligent big data with the rapid expansion of information, real-time detection is becoming an essential criterion for evaluating gas sensors. It is of great significance for the rapid and precise detection of hazardous volatile gases such as n-propanol. In this study, the nanorod-like semiconductor metal sulfide CdS coated with reduced graphene oxide (rGO) nanosheets was utilized to construct a high-performance sensor capable of ultrarapid and accurate n-propanol detection. The sensor based on the CdS/rGO nanocomposite with 0.5 wt% rGO (CG-5) exhibited only 1 s for both response and recovery time to 100 ppm n-propanol, which were shortened by 13 and 2 times compared to pristine CdS, respectively. Meanwhile, the sensor response of CG-5 enhanced 3-fold that of pristine CdS. Additionally, the hydrophobic rGO component in the hybrid endowed the sensor with a strong moisture-interference resistance over 20–98% relative humidity. The excellent selectivity, repeatability, and long-term stability for n-propanol detection were demonstrated as well. The exceptional enhancement in the sensing performance of CG-5 can be ascribed to several contributing factors, including its geometric configuration, weakened hydrophilicity, lowered activation energy, and additional active sites at the heterointerface between CdS and rGO. The rational design of CG-5 made it a promising candidate for the rapid, sensitive, and reliable detection of n-propanol.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 95%

Moisture-Independent Detection of n-Propanol Using a Kinetic Gas Sensor Based on CdS Nanorods Coated with Reduced Graphene Oxide

Gao,

Zhou,

Kong

et al. 2023

ACS Appl. Nano Mater.

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“…In addition, the high-resolution spectrum of Co 2p in the XPS ( Figure 4 b) illustrated the coexisting chemical states of Co 2+ and Co 3+ of the material. The conversion of two types of ions can create additional active sites and induce redox reactions, which improve the sensitivity of the material to different concentrations of H 2 [ 42 , 43 , 44 ].…”

Section: Resultsmentioning

confidence: 99%

Glucose-Assisted Synthesis of Porous, Urchin-like Co3O4 Hierarchical Structures for Low-Concentration Hydrogen Sensing Materials

Deng,

Zhang,

Long

et al. 2024

Materials

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The Co3O4 is a typical p-type metal oxide semiconductor (MOS) that attracted great attention for hydrogen detection. In this work, porous, urchin-like Co3O4 was synthesized using a hydrothermal method with the assistance of glucose and a subsequent calcination process. Urchin-like Co3O4 has a large specific surface area of 81.4 m2/g. The response value of urchin-like Co3O4 to 200 ppm hydrogen at 200 °C is 36.5 (Rg/Ra), while the low-detection limit is as low as 100 ppb. The obtained Co3O4 also exhibited good reproducibility, long-term stability, and selectivity towards various gases (e.g., ammonia, hydrogen, carbon monoxide, and methane). Porous, urchin-like Co3O4 is expected to become a potential candidate for low-concentration hydrogen-sensing materials with the above advantages.

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“…The gas sensing test system and the testing steps are the same as in our previous work [ 23 ]. The system for evaluating gas sensing performance comprises integral components, including a computer, testing chambers, a precision constant current source (GPD-3303S, Instek Digital, New Taipei City, Taiwan), and a FLUKE 8864A tester (Fluke Corporation, Everett, WA, USA).…”

Section: Methodsmentioning

confidence: 99%

Ag2S-Decorated One-Dimensional CdS Nanorods for Rapid Detection and Effective Discrimination of n-Butanol

Gao,

Zhou,

Wang

et al. 2024

Nanomaterials

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N-butanol (C4H9OH) is a volatile organic compound (VOC) that is susceptible to industrial explosions. It has become imperative to develop n-butanol sensors with high selectivity and fast response and recovery kinetics. CdS/Ag2S composite nanomaterials were designed and prepared by the solvothermal method. The incorporation of Ag2S engendered a notable augmentation in specific surface area and a consequential narrow band gap. The CdS/Ag2S-based sensor with 3% molar ratio of Ag2S, operating at 200 °C, demonstrated a remarkably elevated response (S = Ra/Rg = 24.5) when exposed to 100 ppm n-butanol, surpassing the pristine CdS by a factor of approximately four. Furthermore, this sensor exhibited notably shortened response and recovery times, at a mere 4 s and 1 s, respectively. These improvements were ascribed to the one-dimensional single-crystal nanorod structure of CdS, which provided an effective path for expedited electron transport along its axial dimension. Additionally, the electron and chemical sensitization effects resulting from the modification with precious metal sulfides Ag2S were the primary reasons for enhancing the sensor response. This work can contribute to mitigating the safety risks associated with the use of n-butanol in industrial processes.

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Mesoporous Co3O4 nanosheets with exposed Co2+-rich crystal facets for improved toluene detection

Cited by 13 publications

References 42 publications

Moisture-Independent Detection of n-Propanol Using a Kinetic Gas Sensor Based on CdS Nanorods Coated with Reduced Graphene Oxide

Moisture-Independent Detection of n-Propanol Using a Kinetic Gas Sensor Based on CdS Nanorods Coated with Reduced Graphene Oxide

Glucose-Assisted Synthesis of Porous, Urchin-like Co3O4 Hierarchical Structures for Low-Concentration Hydrogen Sensing Materials

Ag2S-Decorated One-Dimensional CdS Nanorods for Rapid Detection and Effective Discrimination of n-Butanol

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