Highly sensitive and selective H2 sensing by ZnO nanofibers and the underlying sensing mechanism

Katoch, Akash; Choi, Sun-Woo; Kim, Hyoun Woo; Kim, Sang Sub

doi:10.1016/j.jhazmat.2014.12.007

Cited by 119 publications

(53 citation statements)

References 41 publications

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“…Nanoscaled ZnO can provide an abundance of H 2 absorption sites because of its large surface area. [6,7] However,Z nO sensors show poor H 2 selectivity because they respond to many types of gases, including H 2, [6][7][8] CO, [6,7] C 2 H 5 OH, [9] NH 3 , [10] and NO 2 . [11] Functional materials are integrated intot he ZnO sensors to overcomet his disadvantage, for example, through the use of Pd films to cover ZnO surfaces and enhance H 2 selectivity.…”

Section: Introductionmentioning

confidence: 99%

A Designed ZnO@ZIF‐8 Core–Shell Nanorod Film as a Gas Sensor with Excellent Selectivity for H₂ over CO

Xiong

Mao

et al. 2017

Chemistry A European J

115

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Abstract:The development of H 2 gas sensors is important for H 2 production as af uel. In this work, aZ nO@ZIF-8c oreshell nanorod film is designed and synthesized as ag as sensor through af acile solutiond eposition process. This film shows an excellent selective response for H 2 over CO. By fine-tuning the reaction conditions, aZ nO@ZIF-8 core-shell structure with at hin, fine-grain, porousZ IF-8 shell is obtained. Owing to the facile H 2 penetration through the ZIF-8 thin shell ( % 110nm) and the increased oxygen vacancies for the complex film, the ZnO@ZIF-8 nanorod film shows ah igher H 2 sensitivity than ar aw ZnO nanorod film. More importantly,t he ZnO@ZIF-8 nanorod film shows no response for CO at 200 8C. Because of the fine-grain confinemento f the porous ZIF-8 shell (< 140 nm), the molecular sieving effect is strengthened, which allows the effective separation of H 2 over CO. This work providesapromising strategy for the design of high-performance H 2 sensors.

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Section: Introductionmentioning

confidence: 99%

A Designed ZnO@ZIF‐8 Core–Shell Nanorod Film as a Gas Sensor with Excellent Selectivity for H₂ over CO

Xiong

Mao

et al. 2017

Chemistry A European J

115

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“…The electrons supplied by the TFMG help to reduce the thickness of the surface depletion region in metallized ZNRs. [44,45] Additionally,w hen hydrogen gas wasi njected into the testing chamber,t he chemisorption of dissociated hydrogen occurred at the surface of the sensors, which altered the state of electrons at the surface. Specifically, oxygen atoms in the ZNR gained electrons from the adsorbed hydrogen atoms,a nd the neighboring zinc atomss imultaneously gained electrons throughb ack-bonding with oxygen atoms.…”

Section: Resultsmentioning

confidence: 99%

High‐Performance Sensor Based on Thin‐Film Metallic Glass/Ultra‐nanocrystalline Diamond/ZnO Nanorod Heterostructures for Detection of Hydrogen Gas at Room Temperature

Huang

Chu

Saravanan

et al. 2019

Chemistry A European J

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This article outlines an ovel materialt oe nablet he detection of hydrogen gas. The material combines thin-film metallic glass (TFMG), ultra-nanocrystalline diamond( UNCD), and ZnO nanorods (ZNRs) andc an be used as ad evice for effective hydrogen gas sensing. Three sensors were fabricated by using combinations of pure ZNRs( Z), UNCD/ZNRs (DZ), and TFMG/UNCD/ZNRs (MDZ). The MDZd evice exhibited ap erformance superior to the other configurations, with as ensing response of 34 %u nder very low hydrogen gas concentrations (10ppm) at room temperature. Remarkably, the MDZ-based sensore xhibits an ultra-high sensitivity of 60.5 %u nder 500 ppm H 2 .T he MDZs ensor provedv ery fast in terms of response time (20 s) and recovery time (35 s). In terms of selectivity,t he sensors were particularly suited to hydrogeng as. The sensora chieved the same response performance even after two months, thereby demonstrating the superior stability. It is postulated that the superior performance of MDZ can be attributed to defect-related adsorption as well as chargecarrierd ensity.T his paper also discusses the respective energyb and models of these heterostructures and also the interface effect on the gas sensing enhancements. The results indicatet hat the proposed hybrid TFMG/UNCD/ZNRs nanostructures could be utilized as highperformance hydrogen gas sensors. 2À ).

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“…The peak at 528.35 eV was attributed to O 2ions in ZnO wurtzite structure of hexagonal Zn 2+ which can be illustrated as Zn-O bonds [41]. The presence of OV in the MZN can be detected at peak 530 eV where this peak illustrated the O 2in the oxygen deficient regions with the matrix of ZnO [42], while the highest peak at 533 eV was assigned to the presence of loosely bound of oxygen on the surface of ZnO [43]. These results confirmed the presence of TSD and OV in the MTN as well as OV in MZN where it is a good prospective because the photocatalyst depends mainly on the OV and TSD especially for application under visible light irradiation.…”

Section: Photodegradation Of Phenol Derivativesmentioning

confidence: 95%

Synthesis of Mesoporous Nanoparticles via Microwave-Assisted Method for Photocatalytic Degradation of Phenol Derivatives

2019

MJAS

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Mesoporous transition metal oxides have gained attention widely since they possess both optical and electronic properties of transition metal oxides especially for photocatalytic degradation application. In this research work, mesoporous titania nanoparticles (MTN) and mesoporous zinc oxide nanoparticles (MZN) were successfully synthesized using microwave (MW)assisted method to degrade phenol derivatives under visible light irradiation. The microwave sintering effect on the surface of these modified structures was studied to relate with their photocatalytic performance. The characterization results indicated that MW-assisted method was mainly contributed in generating Ti 3+ site defects (TSD) and oxygen vacancies (OV) in MTN while for MZN contained only OV as one of the strategies in light-absorption modification for TiO 2 and ZnO to enhance their photoactivity. MTN also showed the degradation of 2-chlorophenol was up to 97% while degradation of phenol by MZN was up to 87%.

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Highly sensitive and selective H2 sensing by ZnO nanofibers and the underlying sensing mechanism

Cited by 119 publications

References 41 publications

A Designed ZnO@ZIF‐8 Core–Shell Nanorod Film as a Gas Sensor with Excellent Selectivity for H₂ over CO

A Designed ZnO@ZIF‐8 Core–Shell Nanorod Film as a Gas Sensor with Excellent Selectivity for H₂ over CO

High‐Performance Sensor Based on Thin‐Film Metallic Glass/Ultra‐nanocrystalline Diamond/ZnO Nanorod Heterostructures for Detection of Hydrogen Gas at Room Temperature

Synthesis of Mesoporous Nanoparticles via Microwave-Assisted Method for Photocatalytic Degradation of Phenol Derivatives

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Highly sensitive and selective H2 sensing by ZnO nanofibers and the underlying sensing mechanism

Cited by 119 publications

References 41 publications

A Designed ZnO@ZIF‐8 Core–Shell Nanorod Film as a Gas Sensor with Excellent Selectivity for H2 over CO

A Designed ZnO@ZIF‐8 Core–Shell Nanorod Film as a Gas Sensor with Excellent Selectivity for H2 over CO

High‐Performance Sensor Based on Thin‐Film Metallic Glass/Ultra‐nanocrystalline Diamond/ZnO Nanorod Heterostructures for Detection of Hydrogen Gas at Room Temperature

Synthesis of Mesoporous Nanoparticles via Microwave-Assisted Method for Photocatalytic Degradation of Phenol Derivatives

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A Designed ZnO@ZIF‐8 Core–Shell Nanorod Film as a Gas Sensor with Excellent Selectivity for H₂ over CO

A Designed ZnO@ZIF‐8 Core–Shell Nanorod Film as a Gas Sensor with Excellent Selectivity for H₂ over CO