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RISS 인기검색어
- 검색키워드
- 저자 : Zain Ul Abideen (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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An ultra-sensitive hydrogen gas sensor using reduced graphene oxide-loaded ZnO nanofibers
Abideen, Zain Ul,Kim, Hyoun Woo,Kim, Sang Sub The Royal Society of Chemistry 2015 Chemical communications Vol.51 No.84
<P>We developed a hydrogen sensor of reduced graphene oxide-loaded ZnO nanofibers. An extremely high response of about 866 at a low concentration of 100 ppb was obtained. The combined effect of the presence of rGO nanosheets and hydrogen-induced metallization of ZnO played a crucial role in enhancing the detection behavior.</P> <P>Graphic Abstract</P><P>An extremely high response of about 866 at a low concentration of 100 ppb was obtained by developing a hydrogen sensor of reduced graphene oxide-loaded ZnO nanofibers. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5cc05370f'> </P>
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Graphene-loaded tin oxide nanofibers: optimization and sensing performance
Abideen, Zain Ul,Park, Jae Young,Kim, Hyoun Woo,Kim, Sang Sub IOP Pub 2017 Nanotechnology Vol.28 No.3
<P>We investigated the gas sensing characteristics of graphene nanosheet (NS)-loaded SnO<SUB>2</SUB> nanofibers (NFs) that were synthesized by a low-cost facile electrospinning process. The sensing performance was characterized as a function of the graphene content with various gases such as C<SUB>6</SUB>H<SUB>6</SUB>, C<SUB>7</SUB>H<SUB>8</SUB>, CO, CO<SUB>2</SUB>, and H<SUB>2</SUB>S. The loading of graphene NSs significantly improved the gas sensing performances of SnO<SUB>2</SUB> NFs. The optimal amount of graphene NSs was found to be 0.5 wt%. We proposed a sensing mechanism for the enhanced sensing performance based on the chemical sensitization of graphene NSs and the charge transfer through the heterointerfaces between graphene NSs and SnO<SUB>2</SUB> nanograins. The results show that graphene NS-loaded SnO<SUB>2</SUB> NFs are a promising sensing material system that can detect hazardous gaseous species.</P>
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Katoch, Akash,Abideen, Zain Ul,Kim, Hyoun Woo,Kim, Sang Sub American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.4
<P>We investigated the effect of grain size on the H-2-sensing behavior of SnO2-ZnO composite nanofibers. The 0.9SnO(2)-0.1ZnO composite nanofibers were calcined at 700 degrees C for various times to control the size of nanograins. A bifunctional sensing mechanism, which is related not only to the SnO2-SnO2 nanograins, but also to the ZnO-SnO2 nanograins with surface metallization effect, is responsible for the grain-oriented H-2-sensing properties and the selective improvement in sensing behavior to H-2 gas compared to other gases. Smaller grains are much more favorable for superior H-2 sensing in SnO2-ZnO composite nanofibers, which will be an important guideline for their use in H-2 sensors. The one-dimensional nanofiber-based structures in the present study will be efficient in maximizing the sensing capabilities by providing a larger amount of junctions.</P>
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Crystallinity Dependent Gas-Sensing Abilities of ZnO Hollow Fibers
Akash Katoch,Zain Ul Abideen,김재훈,Sang Sub Kim 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.5
The grain size and crystallinity are important factors in considering the gas sensing properties of metal oxide based miniaturized gas sensors. This study reports the effects of the grain size and crystallinity on the CO sensing abilities of ZnO hollow fibers (HFs) synthesized by electrospinning. The grain size and crystallinity of the HFs were controlled by changing the heat treatment time during their synthesis and were characterized by SEM, TEM and XRD. Both the nanograin size and crystallinity of the HFs change significantly with increasing heat treatment time. Longer heat treatments result in improved sensing abilities irrespective of the evolution of larger-sized nanograins. Sensing measurements were carried out at various temperatures in the range 300- 400 °C. The improved crystallinity likely compensates the adverse effects of grain growth in terms of the sensor response. That is, crystallinity rather than grain size, is the dominant factor determining the sensing abilities of HFs. This result provides useful guidelines for the fabrication of HF-based chemiresistive-type gas sensors.
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