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Synthesis of flower-like silver nanostructures on silicon and their application in surface-enhanced raman scattering

In this paper, we report on a manufacturing process in which the silver nanoparticles with flower-like shape have been fabricated by chemical deposition of silver particles on silicon wafers, using a solution of hydrofluoric acid (HF), silver nitrate (AgNO3) and ascorbic acid (AsA) in water, at room temperature. | Communications in Physics, Vol. 26, No. 3 (2016), pp. 241-246 DOI:10.15625/0868-3166/26/3/9023 SYNTHESIS OF FLOWER-LIKE SILVER NANOSTRUCTURES ON SILICON AND THEIR APPLICATION IN SURFACE-ENHANCED RAMAN SCATTERING KIEU NGOC MINH1,† , CAO TUAN ANH2 , LUONG TRUC QUYNH NGAN1 , LE VAN VU3 AND DAO TRAN CAO1 1 Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam 2 Tan Trao University, Trung Mon Commune, Yen Son District, Tuyen Quang Province, Vietnam 3 VNU University of Science, Vietnam National University, Hanoi, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam † E-mail: kieungocminhcdvp@gmail.com Received 30 September 2016 Accepted for publication 20 November 2016 Abstract. To enhance the intensity of surface-enhanced Raman scattering (SERS), production of metal nanostructures with sharp points, lying side by side at the nanometer level plays an extremely important role. In this paper, we report on a manufacturing process in which the silver nanoparticles with flower-like shape have been fabricated by chemical deposition of silver particles on silicon wafers, using a solution of hydrofluoric acid (HF), silver nitrate (AgNO3 ) and ascorbic acid (AsA) in water, at room temperature. We found that only when the concentrations of AgNO3 and AsA are appropriate, the flower-like silver nanoparticles will form. Note that while other authors mainly manufactured flower-like silver nanoparticles in the form of suspensions, we have created flower-like silver nanoparticles with cabbage-shape on a silicon surface. These ensembles of flower-like silver nanoparticles were used as SERS substrates to detect crystal violet (CV) in low concentrations. Keywords: SERS, silver, nanoflower, crystal violet. Classification numbers: 33.20Fb, 73.20.Mf, 81.07.-b, 81.16.Be. c 2016 Vietnam Academy of Science and Technology 242 SYNTHESIS OF FLOWER-LIKE SILVER NANOSTRUCTURES ON SILICON . I. INTRODUCTION It is well known that .