Jong Keum

Position: X-Ray Laboratory Scientist

Facility: Spallation Neutron Source


Phone: (216) 534-6132


PhD in Chemistry (Polymer Chemistry) 9/2002 - 12/2007 State University of New York at Stony Brook


  • X-ray and neutron small-angle scattering (SAXS, SANS) of the nanoscale structure of soft matters and nanomaterials
  • Structure and electronic properties of conjugated polymer thin films: grazing-incidence small- and wide-angle X-ray scattering (GI-SAXS, GI-WAXS), neutron and X-ray reflectivity (NR, XRR), and X-ray diffraction (XRD)
  • Physics of crystallization and self-assembly of confined polymers

Selected Publications

  • Shao, M; Keum, JK; Kumar, R; Chen, J; Browning, JF; Das, S; Chen, W; Hou, J; Do, C; Littrell, KC; Rondinone, AJ; Geohegan, DB; Sumpter, BG; Xiao, K. “Understanding how processing additives tune the nanoscale morphology of high efficiency organic photovoltaic blends: from casting solution to spun‐cast thin film” Advance Functional Materials (2014), 24, 6647.
  • Shao, M; Keum, JK; Chen, J; He, Y; Chen, Wei; Browning, JF; Jakowski, J; Sumpter, BG; Ivanov, I; Ma, Y-J; Rouleau, CM; Smith, SC; Geohegan, DB; Hong, K; Xiao, K. “The isotopic effects of deuteration on optoelectronic properties of conducting polymers.” Nature Communications (2014), 5, doi:10.1038/ncomms4180.
  • Keum, JK; Browning, JF; Xiao, K; Shao, M; Halbert, CE; Hong, K. “Morphological origin for the stratification of P3HT:PCBM blend film studied by neutron reflectometry.” Applied Physics Letters (2013), 103, 223301.
  • Xiao, K; Deng, W; Keum, JK; Yoon, M; Vlassiouk, IV; Clark, KW; Li, A-P; Kravchenko, II; Gu, G; Payzant, EA; Sumpter, BG; Smith, SC; Browning, JF; Geohegan, DG. “Surface-Induced Orientation Control of CuPc Molecules for the Epitaxial Growth of Highly Ordered Organic Crystals on Graphene.” Journal of American Chemical Society (2013), 135, 3680–3687.
  • Keum, JK; Xiao, K; Ivanov, IN; Hong, K; Browning, JF; Smith, GS; Shao, M; Littrell, KC; Rondinone, AJ; Payzant, EA; Chen, J; Hensley, DJ. “Solvent quality-induced nucleation and growth of parallelepiped nanorods in dilute poly(3-hexylthiophene) (P3HT) solution and the impact on the crystalline morphology of solution-cast thin film.” CrystEngComm (2013),15, 1114-1124.
  • Sun, Z; Xiao, K; Keum, JK; Yu, X; Hong, K; Browning, J; Ivanov, I; Chen, J; Alonzo Calderon, JE; Li, D; Sumpter, B; Pyzant, A; Rouleau, R; Geohegon, D. “PS-b-P3HT Copolymers as P3HT/PCBM interfacial Compatibilizers for High Efficiency Photovoltaics.” Advanced Materials (2011), 23, 5529.
  • Wang, H; Keum, JK; Hiltner, A; Baer, E; Freeman, B. “Confined Crystallization of Polyethylene Oxide in Nanolayer Assemblies.” Science (2009), 423, 757.