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Fabrication of Worm-Like Nanorods and Ultrafine Nanospheres of Silver Via Solid-State Photochemical Decomposition

S Navaladian, B Viswanathan, TK Varadarajan and RP Viswanath*

Author Affiliations

National Centre for Catalysis Research, Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600 036, India

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Nanoscale Research Letters 2009, 4:471-479  doi:10.1007/s11671-009-9267-0

Published: 21 February 2009


Worm-like nanorods and nanospheres of silver have been synthesized by photochemical decomposition of silver oxalate in water by UV irradiation in the presence of CTAB and PVP, respectively. No external seeds have been employed for the synthesis of Ag nanorods. The synthesized Ag colloids have been characterized by UV-visible spectra, powder XRD, HRTEM, and selected area electron diffraction (SAED). Ag nanospheres of average size around 2 nm have been obtained in the presence of PVP. XRD and TEM analyses revealed that top and basal planes of nanorods are bound with {111} facets. Williamson–Hall plot has revealed the presence of defects in the Ag nanospheres and nanorods. Formation of defective Ag nanocrystals is attributed to the heating effect of UV-visible irradiation.

Ag nanorods; Nanospheres; CTAB; PVP; Photochemical decomposition; WH plot