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Controllable Electrochemical Synthesis of Ag Hierarchical Micro/Nanostructures with High SERS-Activity

Key Laboratory of Optical Field Manipulation of Zhejiang Province and Key Laboratory of ATMMT Ministry of Education, Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China

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Jingjing Wang

http://orcid.org/0000-0002-8167-7480

Key Laboratory of Optical Field Manipulation of Zhejiang Province and Key Laboratory of ATMMT Ministry of Education, Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China

E-mail Address: jjwang@zstu.edu.cn

Corresponding authors.

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Qiong Yang

Key Laboratory of Optical Field Manipulation of Zhejiang Province and Key Laboratory of ATMMT Ministry of Education, Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China

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Menglei Chen

School of Physics and Electronic Information, Anhui Normal University, Wuhu 241000, P. R. China

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Changsheng Song

Key Laboratory of Optical Field Manipulation of Zhejiang Province and Key Laboratory of ATMMT Ministry of Education, Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China

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Jiaqi Pan

Key Laboratory of Optical Field Manipulation of Zhejiang Province and Key Laboratory of ATMMT Ministry of Education, Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China

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Qing Chen

Key Laboratory of Optical Field Manipulation of Zhejiang Province and Key Laboratory of ATMMT Ministry of Education, Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China

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, and

Chaorong Li

Key Laboratory of Optical Field Manipulation of Zhejiang Province and Key Laboratory of ATMMT Ministry of Education, Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China

E-mail Address: crli@zstu.edu.cn

Corresponding authors.

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https://doi.org/10.1142/S1793292020500435Cited by:0 (Source: Crossref)

Abstract

We report a one-step electrochemical deposition technique to prepare three-dimensional (3D) Ag hierarchical micro/nanostructured film consisting of well-crystallized Ag nanosheets grown on an indium tin oxide (ITO) conductive substrate. The Ag hierarchical micro/nanostructures were fabricated in the mixed solution of AgNO₃ and sodium citrate in a constant current system at room temperature. Through reduction of Ag $^{+}$ $^{+}$ electrodeposited on the surface of ITO substrate, nanoparticles were grown to form nanosheets which further combined into 3D sphere-like microstructures. The 3D Ag micro/nanostructures have many sharp edges and nanoscale gaps which can give rise to good Raman-enhanced effect. Due to localized surface plasmon resonance (LSPR) effects, these special Ag micro/nanostructures exhibited good Raman-enhanced performance. Using Rhodamine 6G (R6G) molecules as probe molecule, we studied the influence of excitation wavelength on Raman enhancement. The results showed that the 532nm excitation wavelength is the best to obtain the strongest Raman signal and to reduce the influence of other impurity peaks. Using the as-synthesized Ag hierarchical micro/nanostructures, we can detect the 10 $^{- 10}$ $^{- 10}$ mol/L R6G aqueous solution, exhibiting great Raman-enhanced effect.

Keywords:

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