Growth of carbon nanowalls at atmospheric pressure for one-step gas sensor fabrication

Autor: Zhu Yanwu, Ruoff Rodney, Chen Xinqi, Yu Kehan, Bo Zheng, Lu Ganhua, Mao Shun, Cui Shumao, Chen Junhong
Jazyk: angličtina
Rok vydání: 2011
Předmět:
Zdroj: Nanoscale Research Letters, Vol 6, Iss 1, p 202 (2011)
Druh dokumentu: article
ISSN: 1931-7573
1556-276X
Popis: Abstract Carbon nanowalls (CNWs), two-dimensional "graphitic" platelets that are typically oriented vertically on a substrate, can exhibit similar properties as graphene. Growth of CNWs reported to date was exclusively carried out at a low pressure. Here, we report on the synthesis of CNWs at atmosphere pressure using "direct current plasma-enhanced chemical vapor deposition" by taking advantage of the high electric field generated in a pin-plate dc glow discharge. CNWs were grown on silicon, stainless steel, and copper substrates without deliberate introduction of catalysts. The as-grown CNW material was mainly mono- and few-layer graphene having patches of O-containing functional groups. However, Raman and X-ray photoelectron spectroscopies confirmed that most of the oxygen groups could be removed by thermal annealing. A gas-sensing device based on such CNWs was fabricated on metal electrodes through direct growth. The sensor responded to relatively low concentrations of NO2 (g) and NH3 (g), thus suggesting high-quality CNWs that are useful for room temperature gas sensors. PACS: Graphene (81.05.ue), Chemical vapor deposition (81.15.Gh), Gas sensors (07.07.Df), Atmospheric pressure (92.60.hv)
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