Carbon nanocoils decorated with scale-like mesoporous NiO nanosheets for ultrasensitive room temperature ppb-level NO<sub>2</sub> sensing

Sun, Yongli; Ding, Zhezhe; Zhang, Yupeng; Dong, Zhe; Sun, Lei; Wang, Neng; Yin, Maosheng; Jian, Zhang; Wang, Guo Ping

doi:10.1039/d2cp04860d

Cited by 5 publications

(2 citation statements)

References 48 publications

(50 reference statements)

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“…For example, a NO 2 sensor based on CNCs decorated with NiO nanosheets has been developed using a hydrothermal method. This sensor has a detection concentration limit of 60.3 ppb and demonstrates selectivity towards NO 2 at RT [29]. However, it should be noted that this sensor requires a lengthy hydrothermal reaction time and exhibits a relatively subdued response.…”

Section: Introductionmentioning

confidence: 99%

Microwave-Solvothermal Synthesis of Mesoporous CeO2/CNCs Nanocomposite for Enhanced Room Temperature NO2 Detection

Sun,

Lu,

Huang

et al. 2024

Nanomaterials

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Nitrogen dioxide (NO2) gas sensors are pivotal in upholding environmental integrity and human health, necessitating heightened sensitivity and exceptional selectivity. Despite the prevalent use of metal oxide semiconductors (MOSs) for NO2 detection, extant solutions exhibit shortcomings in meeting practical application criteria, specifically in response, selectivity, and operational temperatures. Here, we successfully employed a facile microwave-solvothermal method to synthesize a mesoporous CeO2/CNCs nanocomposite. This methodology entails the rapid and comprehensive dispersion of CeO2 nanoparticles onto helical carbon nanocoils (CNCs), resulting in augmented electronic conductivity and an abundance of active sites within the composite. Consequently, the gas-sensing sensitivity of the nanocomposite at room temperature experienced a notable enhancement. Moreover, the presence of cerium oxide and the conversion of Ce3+ and Ce4+ ions facilitated the generation of oxygen vacancies in the composites, thereby further amplifying the sensing performance. Experimental outcomes demonstrate that the nanocomposite exhibited an approximate 9-fold increase in response to 50 ppm NO2 in comparison to pure CNCs at room temperature. Additionally, the CeO2/CNCs sensor displayed remarkable selectivity towards NO2 when exposed to gases such as NH3, CO, SO2, CO2, and C2H5OH. This straightforward microwave-solvothermal method presents an appealing strategy for the research and development of intelligent sensors based on CNCs nanomaterials.

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Section: Introductionmentioning

confidence: 99%

Microwave-Solvothermal Synthesis of Mesoporous CeO2/CNCs Nanocomposite for Enhanced Room Temperature NO2 Detection

Sun,

Lu,

Huang

et al. 2024

Nanomaterials

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“…Utilizing this distinctive structure and its excellent electrical conductivity, CNC has found applications in various fields, including flexible sensor, , microwave absorber, − electrochemistry, , filler of thermoelectric composite, gas sensor, , magnetism mixture, and so on.…”

Section: Introductionmentioning

confidence: 99%

Probing the Thermoelectricity in Single Carbon Nanocoil for the Design of a Nano Thermocouple

Wei,

Wu,

Zhang

et al. 2024

ACS Appl. Nano Mater.

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Carbon nanocoils (CNCs) have been discovered and studied for years. Its good electrical conductivity and low lattice thermal conductivity suggest the application potential in thermoelectricity, which was studied for the first time in this work. Individual CNCs were suspended between two substrates with electrical heaters to create the desired temperature differences. Employing a transient electro-thermal technique, the thermoelectric, electrical, and heat transport properties of CNCs from 298 to 343 K before and after in situ Joule annealing were characterized simultaneously. CNCs exhibit asymmetric thermoelectric responses, with average Seebeck coefficients along the two length directions of 1.5 and 0.9 μV/K. This asymmetry results from different bandgaps along the growth direction, and the small Seebeck coefficient results from strong mixed electrical conductivity. The Fermi energy and optical bandgap of CNCs were measured to be 11.2 and 58.2 meV, respectively, with a small hole–electron conductivity ratio (1.36). The Seebeck coefficient shows a negative correlation with the electrical conductivity, while the thermal conductivity shows no observable correlation with them, hovering around 8.3 W/m K at room temperature. Doping may be an effective strategy to increase the Seebeck coefficient and electrical conductivity while decreasing the thermal conductivity for improved thermoelectric conversion. In addition, a flexible nanothermocouple based on two intertwined single CNCs was developed, which shows excellent response to thermal excitation.

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Emerging helical carbon nanocoils: A new platform for advanced multifunctional applications

Zhao,

Sha,

Wang

et al. 2024

Carbon

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Carbon nanocoils decorated with scale-like mesoporous NiO nanosheets for ultrasensitive room temperature ppb-level NO₂ sensing

Abstract: Although NO2 detection based on metal oxide semiconductors (MOS) has received continuous attention, the sensing properties of MOS still need to be further improved for practical application. Carbon nanocoils (CNCs)...

Cited by 5 publications

References 48 publications

Microwave-Solvothermal Synthesis of Mesoporous CeO2/CNCs Nanocomposite for Enhanced Room Temperature NO2 Detection

Microwave-Solvothermal Synthesis of Mesoporous CeO2/CNCs Nanocomposite for Enhanced Room Temperature NO2 Detection

Probing the Thermoelectricity in Single Carbon Nanocoil for the Design of a Nano Thermocouple

Emerging helical carbon nanocoils: A new platform for advanced multifunctional applications

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Carbon nanocoils decorated with scale-like mesoporous NiO nanosheets for ultrasensitive room temperature ppb-level NO2 sensing

Abstract: Although NO2 detection based on metal oxide semiconductors (MOS) has received continuous attention, the sensing properties of MOS still need to be further improved for practical application. Carbon nanocoils (CNCs)...

Cited by 5 publications

References 48 publications

Microwave-Solvothermal Synthesis of Mesoporous CeO2/CNCs Nanocomposite for Enhanced Room Temperature NO2 Detection

Microwave-Solvothermal Synthesis of Mesoporous CeO2/CNCs Nanocomposite for Enhanced Room Temperature NO2 Detection

Probing the Thermoelectricity in Single Carbon Nanocoil for the Design of a Nano Thermocouple

Emerging helical carbon nanocoils: A new platform for advanced multifunctional applications

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Product

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Carbon nanocoils decorated with scale-like mesoporous NiO nanosheets for ultrasensitive room temperature ppb-level NO₂ sensing