Contents lists available at ScienceDirect Colloids and Surfaces A journal homepage: www.elsevier.com/locate/colsurfa Facile preparation of gold-coated polydimethylsiloxane particles by in situ reduction without pre-synthesized seed Min-Cheol Lim a , Kisang Park a,b , Sae-Hyung Kim b , Gyeongsik Ok a , Sung-Wook Choi a , Min-Ah Woo a, ⁎ a Korea Food Research Institute, Seongnam, Republic of Korea b Department of Molecular Science and Technology, Ajou University, Suwon, Republic of Korea GRAPHICAL ABSTRACT ARTICLE INFO Keywords: Gold nanoparticle PDMS particle Reduction Auric acid Sodium citrate ABSTRACT Herein, we develop a facile strategy for the preparation of polydimethylsiloxane (PDMS) microparticles deco- rated with gold nanoparticles (AuNPs) by the reduction of gold chloride on the surface of PDMS microparticles using sodium citrate. To prepare the AuNP-seeded particles, AuNP-seeded PDMS microparticles were simply produced in situ by the reduction of a PDMS curing agent without the use of any additional reducing agents. The resultant AuNP-seeded PDMS microparticles were further reacted with sodium citrate and gold chloride to synthesize AuNP clusters on the PDMS microparticle surfaces. The synthesized AuNP-coated PDMS micro- particles were extensively characterized using scanning electron microscopy, X-ray diffraction, X-ray photo- electron spectroscopy, and UV–vis absorption spectroscopy. Notably, the surface coverage of AuNPs on the PDMS microparticles could be easily controlled using this proposed method. http://dx.doi.org/10.1016/j.colsurfa.2017.07.003 Received 8 June 2017; Received in revised form 3 July 2017; Accepted 4 July 2017 ⁎ Corresponding author. E-mail address: mawoo@kfri.re.kr (M.-A. Woo). Colloids and Surfaces A 529 (2017) 916–921 0927-7757/ © 2017 Elsevier B.V. All rights reserved. MARK