1         Kaya Wei 1 , Joshua Martin 2 , James R. Salvador 3 , and George S. Nolas 1, * 1 Department of Physics, University of South Florida, Tampa, FL 33620 2 Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899 3 Chemical and Materials Systems Laboratory, GM R&D Center, Warren, MI 48090 PbCuSbS 3 nanocrystals were synthesized by a colloidal synthesis route and characterized by powder X&ray diffraction (XRD), transmission electron microscopy (TEM) and electron diffraction spectroscopy (EDS). PbCuSbS 3 particle sizes of 5 nm, 150 nm, and 200 nm were obtained by adjusting the reaction time. The optical band&gap, thermal stability, heat capacity, and magnetic susceptibility of PbCuSbS 3 were also investigated. PbCuSbS 3 is diamagnetic with an optical band&gap of 1.31 eV and a Debye temperature of 157 K. This study aims to expand and broaden our knowledge of PbCuSbS 3 in light of the recent interest in multinary chalcogenides for energy&related applications. *George S. Nolas, Ph.D. Professor of Physics, ISA 2019 University of South Florida 4202 East Fowler Avenue Tampa, FL 33620 Phone:(813) 974&2233 FAX: (813) 974&5813 E&mail:gnolas@usf.edu Web: http://shell.cas.usf.edu/gnolas/ Page 1 of 22 ACS Paragon Plus Environment Crystal Growth & Design 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60