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Decoration of Ag nanoparticles on reduced graphene oxide and their application to gas sensors

강성용|김현우|이종무|최명식|정택균|권용중|강우승|방재훈|나한길
청정에너지연구소 (Clean-Energy Research Institute)|2016.06|Journal of Ceramic Processing Research|제17권 제6호|pp. 523-531|DOI 10.36410/jcpr.2016.17.6.523

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참고문헌

키워드

SensorsReduced graphene oxideAg
주제분류재료공학

초록

We fabricated functionalized RGO that demonstrates excellent sensitivity to H2S gas. The functionalization process used GOsuspensions mixed with AgNO3, NaOH, and DI water. X-ray diffraction (XRD) and transmission electron microscopyindicated that the functionalizing structures were composed of cubic Ag and silver oxide (AgxOy) phases. Nanoparticles andnanorods with a cubic Ag phase were attached to the surface of the RGO. Raman spectra revealed that the structural disorderof the functionalized RGO was higher than that of pristine GO. The decrease of resistance by the introduction of H2S gasindicated that the functionalized RGO was an n-type sensor. Accordingly, we suggested that the n-type AgxOy, whose presencewas confirmed by XRD, should be a main current path for the sensor. A H2S gas sensing test revealed that the sensor responseat 50 ppm was about 1.65. With respect to H2S sensing mechanisms, we propose that the following four reasons could explainthe significant enhanced sensitivity by the functionalization: (i) reduction of the conduction volume by the conduction throughthe AgxOy structure rather than RGO, (ii) generation of silver sulfide structures, (iii) generation of an n-AgxOy/p-RGOheterointerface, and (iv) larger surface area of Ag/AgxOy structures. The Ag catalyst is not only the source of the AgxOy, butalso provides the spillover effect.

Abstract

We fabricated functionalized RGO that demonstrates excellent sensitivity to H2S gas. The functionalization process used GOsuspensions mixed with AgNO3, NaOH, and DI water. X-ray diffraction (XRD) and transmission electron microscopyindicated that the functionalizing structures were composed of cubic Ag and silver oxide (AgxOy) phases. Nanoparticles andnanorods with a cubic Ag phase were attached to the surface of the RGO. Raman spectra revealed that the structural disorderof the functionalized RGO was higher than that of pristine GO. The decrease of resistance by the introduction of H2S gasindicated that the functionalized RGO was an n-type sensor. Accordingly, we suggested that the n-type AgxOy, whose presencewas confirmed by XRD, should be a main current path for the sensor. A H2S gas sensing test revealed that the sensor responseat 50 ppm was about 1.65. With respect to H2S sensing mechanisms, we propose that the following four reasons could explainthe significant enhanced sensitivity by the functionalization: (i) reduction of the conduction volume by the conduction throughthe AgxOy structure rather than RGO, (ii) generation of silver sulfide structures, (iii) generation of an n-AgxOy/p-RGOheterointerface, and (iv) larger surface area of Ag/AgxOy structures. The Ag catalyst is not only the source of the AgxOy, butalso provides the spillover effect.

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