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Nanomaterials 2012, 2, 54-64; doi:10.3390/nano2010054 OPEN ACCESS nanomaterials ISSN 2079-4991 /journal/nanomaterials Article Synthesis and Size Dependent Reflectance Study of Water Soluble SnS Nanoparticles Ying Xu 1, Najeh Al-Salim 2,* and Richard D. Tilley 1,* 1 School of Chemical and Physical Sciences, MacDiarmid Institute of Advance Materials and Nanotechnology, Victoria University of Wellington, P.O. Box 600, Wellington 6011, New Zealand; E-Mail: Sherry.Xu@vuw.ac.nz 2 Industrial Research, Ltd., P.O. Box 31-310, Lower Hutt 5010, New Zealand * Authors to whom correspondence should be addressed; E-Mails: n.al-salim@irl.cri.nz (N.A.-S.); richard.tilley@vuw.ac.nz (R.D.T.); Tel.: +64-4-5690049 (N.A.-S.); +64-4-4635016 (R.D.T.); Fax: +64-4-5690142 (N.A.-S.); +64-4-4635237 (R.D.T.). Received: 21 December 2011; in revised form: 4 January 2012 / Accepted: 5 January 2012 / Published: 16 January 2012 Abstract: Near-monodispersed water soluble SnS nanoparticles in the diameter range of 3–6 nm are synthesized by a facile, solution based one-step approach using ethanolamine ligands. The optimal amount of triethanolamine is investigated. The effect of further heat treatment on the size of these SnS nanoparticles is discussed. Diffuse reflectance study of SnS nanoparticles agrees with predictions from quantum confinement model. Keywords: tin sulfide; nanoparticles; triethanolamine; water soluble; diffuse reflectance 1. Introduction Semiconductor nanoparticles are of great interest due to their unique size-dependent optical properties