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one-step electrochemical fabrication of vertically self-organization silvernangrass.pdf

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one-step electrochemical fabrication of vertically self-organization silvernangrass

Journal of Materials Chemistry A PAPER P u b l i s h e d o n 0 7 F e b r u a r y 2 0 1 3 . D o w n l o a d e d b y Z h e j i a n g U n i v e r s i t y o n 1 3 / 0 6 / 2 0 1 3 0 9 : 2 6 : 3 0 . View Article Online View Journal | View IssueaDepartment of Chemical and Biomolecula 120-749, Republic of Korea. E-mail: haam@ +82 2-2123-3554 bDepartment of Physics, Yonsei University, S cSchool of Integrated Technology, Yonsei U Korea dDepartment of Radiology, College of Med Republic of Korea. E-mail: ymhuh@yuhs.ac ? Electronic supplementary informa 10.1039/c3ta01278f Cite this: J. Mater. Chem. A, 2013, 1, 4851 Received 28th November 2012 Accepted 7th February 2013 DOI: 10.1039/c3ta01278f /MaterialsA This journal is a The Royal Society ofOne-step electrochemical fabrication of vertically self-organized silver nanograss? Doyeon Bang,a Young Wook Chang,b Joseph Park,a Taeksu Lee,a Jiyun Park,c Jong-Souk Yeo,c Eun-Kyung Kim,a Kyung-Hwa Yoo,b Yong-Min Huh*d and Seungjoo Haam*a Fabrication of one dimensional metal nanomaterials offers many beneficial aspects due to their unique size- and shape-dependent characteristics. However, facile fabrication of a robust one dimensional nanostructure has still remained a great challenge. Here, we developed a new synthetic route of one- step electrochemical deposition of silver nanograss without the assistance of a template. By applying an overpotential of 2.0 V (vs. Ag/AgCl) under aqueous alkaline conditions, silver nanograss with a slight tilt in a randomly oriented direction was spontaneously formed on the working electrode surface. Two applications that utilize advantageous features of this silver nanograss were demonstrated: (i) an efficient surface-enhanced Raman scattering substrate for a chemical sensor and (ii) an enzyme-less hydrogen peroxide sensor. Compared to silver nanowire arrays fabricated using anodized aluminum oxide (AAO) templates, the silver nanograss exhibited comparable hydrogen sensing due to its catalyti