RF sputtered CuO anchored SnO2 for H2S gas sensor

Kumar, Amit; Shringi, Amit Kumar; Kumar, Mahesh

doi:10.1016/j.snb.2022.132417

Cited by 43 publications

(17 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The gas sensing characteristics were carried out at various concentrations from 0.5 to 50 ppm of H 2 S gas, depending upon the OSHA limits. The decrease in resistance (Figure S5) is due to the decrement in the depletion layer (space charge region) formed due to oxygen adsorption on SnO 2 nanofibers . As the operating temperature increased, an increase in the gas response was seen for different concentrations of H 2 S gas.…”

Section: Resultsmentioning

confidence: 99%

“…To increase the sensing response of SnO 2 nanofibers, the decoration of a p-type semiconductor was introduced. CuO, due to its high catalytic activity, is well suited for SnO 2 semiconductors. , CuO decoration for 30, 60, and 90 s on SnO 2 nanofibers was done to understand the effect of the p-type material on n-type SnO 2 nanofibers. The CuO-decorated nanofibers were exposed to various concentrations of H 2 S gas operated at 200 °C.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Highly Efficient CuO-Anchored SnO₂ Nanofiber for Low-Concentration H₂S Gas Sensors

Ruksana,

Kumar,

Lakshmy

et al. 2024

ACS Appl. Eng. Mater.

Self Cite

View full text Add to dashboard Cite

Metal oxide-based chemiresistive gas sensors are reliable for detecting low concentrations of hydrogen sulfide (H 2 S) gas, which pose significant harm to human health. This article highlights the improvement in H 2 S gas detection by using CuO-decorated SnO 2 nanofibers, which are synthesized by combining electrospinning and sputtering. The electrospun PVP/SnO 2 fibers are calcinated at 600 °C, reducing the diameter from 498 to 220 nm, which enhances crystallinity, favoring improved H 2 S sensing. The efficacy of H 2 S gas detection using CuO-decorated SnO 2 nanofibers was explored at a temperature ranging from 50 to 200 °C. CuO sputtered nanoparticles for 30, 60, and 90 s, respectively, on SnO 2 nanofibers improve the gas relative response, showing the importance of composite material toward sensing. The catalytic abilities of CuO sputtered nanoparticles for 60 s on SnO 2 nanofibers boost the gas relative response to 85.71% for 50 ppm of H 2 S gas at 200 °C�an improvement of 25% more than the pristine SnO 2 nanofibers. CuO-decorated SnO 2 nanofibers showed an excellent adsorption/desorption property with response and recovery times of 100 and 109 s for 50 ppm of H 2 S. First-principles calculations indicate that the O-adsorbed SnO 2 /CuO system has potential for H 2 S gas detection due to its high adsorption energy of −2.21 eV, charge transfer of 0.65 e − , and orbital interactions. Our findings conclude the superiority of CuO-decorated SnO 2 nanofibers in detecting the H 2 S gas at low concentrations for industrial applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Highly Efficient CuO-Anchored SnO₂ Nanofiber for Low-Concentration H₂S Gas Sensors

Ruksana,

Kumar,

Lakshmy

et al. 2024

ACS Appl. Eng. Mater.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Several nanostructured materials, owing to their high surface-to-volume ratio, have been explored to detect different VOCs. , Cupric oxide (CuO) is p-type semiconducting material that has been extensively used for developing sensors for several VOCs . For instance, Hu et al developed CuO nanoneedle arrays for sensing H 2 S . Kumar et al deposited CuO on SnO 2 through RF sputtering and employed the same for sensing H 2 S .…”

Section: Introductionmentioning

confidence: 99%

“…used for developing sensors for several VOCs 17. For instance, Hu et al developed CuO nanoneedle arrays for sensing H 2 S 18. Kumar et al deposited CuO on SnO 2 through RF sputtering and employed the same for sensing H 2 S 19.…”

mentioning

confidence: 99%

CuO Nanoflake-Based Sensors for Detecting Linalool, Hexanal, and Methyl Salicylate

Kulkarni

Kummara

Gorthala

et al. 2022

ACS Agric. Sci. Technol.

View full text Add to dashboard Cite

Crops emit volatile organic compounds (VOCs) when infested with diseases or pests as a natural self-defense mechanism. These VOCs can effectively indicate the biotic stresses of crops and, hence, can be termed as biomarkers of crop stress. This study reports the development of cupric oxide (CuO) nanoflake-based resistive sensors for the detection of linalool, methyl salicylate, and hexanal, which indicate biotic stresses in multiple crops, including maize. CuO nanoflakes were synthesized using a hydrothermal method. Their lateral dimensions were found to be ∼300 nm, and the thickness was ∼28 nm when studied using a field emission scanning electron microscope. The band gap of the semiconducting material was ascertained to be 1.82 eV through UV–visible spectroscopy. The CuO sensors were tested at different temperatures and were found to exhibit the highest response to all the target vapors at 250 °C. The sensors were tested at different concentrations (25–200 ppm) of the three VOCs. The response of the CuO sensor was found to be the highest for linalool and ranged from 6.7 to 13.3 times. The response was found to be 4.7–12.2 times for methyl salicylate and 1.2–2.7 times for hexanal at 250 °C. As selectivity is an important parameter of any sensor, a novel technique with a simple algorithm considering the response of the CuO nanoflakes at two different temperatures (250 and 300 °C) was developed to improve the selectivity and the prediction accuracy of the sensors.

show abstract

“…Metal oxide semiconductor (MOS)-based gas sensors have shown wide application prospects in the detection of inflammable and explosive gases, environmental pollution, toxic gases, and VOCs, − especially in the field of human-disease monitoring based on oral exhaled breath detection, − due to their advantages of high sensitivities, small sizes, real-time measurement capabilities, low costs, and portability. , Among the H 2 S-gas-sensitive materials studied, − Cu 2 O stands out due to its high chemical affinity for sulfur components, which is not only conducive to improving the sensitivity of the materials but also guarantees the selectivity by preventing cross-reactions with other gases. In addition, to further improve the gas sensitivity, many researchers have prepared composite materials through the interactions of Cu 2 O with other nanoscale components, thereby achieving better performance than the sum of the individual components.…”

mentioning

confidence: 99%

Ultrasensitive Bio-H₂S Gas Sensor Based on Cu₂O-MWCNT Heterostructures

Lu,

Chi,

Chen

et al. 2023

ACS Sens.

View full text Add to dashboard Cite

Developing a respiratory analysis disease diagnosis platform for the H2S biomarker has great significance for the real-time detection of various diseases. However, achieving highly sensitive and rapid detection of H2S gas at the parts per billion level at low temperatures is one of the most critical challenges for developing portable exhaled gas sensors. Herein, Cu2O-multiwalled carbon nanotube (MWCNT) heterostructures with excellent gas sensitivity to H2S at room temperature and a lower temperature were successfully synthesized by a facile two-dimensional (2D) electrodeposition in situ assembly method. The combination of Cu2O and MWCNTs via the principle of optimal conductance growth not only reduced the initial resistance of the material but also provided an ideal interfacial barrier structure. Compared to the response of the pure Cu2O sensor, that of the Cu2O-MWCNT sensor to 1 ppm of H2S increased nearly 800 times at room temperature, and the response time decreased by more than 500 s. In addition to the excellent sensitivity with detection limits as low as 1 ppb, the Cu2O-MWCNT sensor was extremely selective with low-temperature adaptability. The sensor had a response value of 80.6 to 0.1 ppm of H2S at −10 °C, which is difficult to achieve with sensors based on oxygen adsorption/desorption mechanisms. The sensor was used for the detection of real oral exhaled breath, confirming its feasibility as a real-time disease monitoring sensor. The Cu2O-MWCNT heterostructures maximized the advantages of the individual components and laid the experimental foundation for future applications of highly sensitive portable breath analysis platforms for monitoring H2S.

show abstract

RF sputtered CuO anchored SnO2 for H2S gas sensor

Cited by 43 publications

References 37 publications

Highly Efficient CuO-Anchored SnO₂ Nanofiber for Low-Concentration H₂S Gas Sensors

Highly Efficient CuO-Anchored SnO₂ Nanofiber for Low-Concentration H₂S Gas Sensors

CuO Nanoflake-Based Sensors for Detecting Linalool, Hexanal, and Methyl Salicylate

Ultrasensitive Bio-H₂S Gas Sensor Based on Cu₂O-MWCNT Heterostructures

Contact Info

Product

Resources

About

RF sputtered CuO anchored SnO2 for H2S gas sensor

Cited by 43 publications

References 37 publications

Highly Efficient CuO-Anchored SnO2 Nanofiber for Low-Concentration H2S Gas Sensors

Highly Efficient CuO-Anchored SnO2 Nanofiber for Low-Concentration H2S Gas Sensors

CuO Nanoflake-Based Sensors for Detecting Linalool, Hexanal, and Methyl Salicylate

Ultrasensitive Bio-H2S Gas Sensor Based on Cu2O-MWCNT Heterostructures

Contact Info

Product

Resources

About

Highly Efficient CuO-Anchored SnO₂ Nanofiber for Low-Concentration H₂S Gas Sensors

Highly Efficient CuO-Anchored SnO₂ Nanofiber for Low-Concentration H₂S Gas Sensors

Ultrasensitive Bio-H₂S Gas Sensor Based on Cu₂O-MWCNT Heterostructures