TY - JOUR
T1 - Two-Phase Synthesis of Gold-Copper Bimetallic Nanoparticles of Tunable Composition
T2 - Toward Optimized Catalytic CO2 Reduction
AU - Hofmann, Daniel M.
AU - Fairbrother, D. Howard
AU - Hamers, Robert J.
AU - Murphy, Catherine J.
N1 - Funding Information:
This work was supported by the National Science Foundation under the Center for Sustainable Nanotechnology (CSN), CHE-1503408. The CSN is part of the Centers for Chemical Innovation Program. This work was performed in part in the Frederick Seitz Materials Research Laboratory Central Research Facilities, University of Illinois at Urbana− Champaign. Use of the Center for Nanoscale Materials, an Office of Science user facility at Argonne National Laboratory, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract DE-AC02-06CH11357. ICP-MS and ICP-OES data were completed with help from the Microanalysis Center, School of Chemical Sciences, University of Illinois at Urbana− Champaign. We thank Dr. Toby Woods, Dr. Danielle Gray, and the University of Illinois at Urbana−Champaign’s School of Chemical Sciences George L. Clark X-ray Facility & 3M Materials Laboratory for assistance with XRD. We thank Dr. Jianguo Wen for his assistance with EDS and EELS at Argonne National Lab, Dr. Richard T Haasch for his assistance with XPS, Dr. Ralph G. Nuzzo for his assistance with XPS interpretation, Dr. Lingyang Zhu for her assistance with DOSY-NMR, and Meng Wu for his assistance with NMR analysis.
Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/6/28
Y1 - 2019/6/28
N2 - Ultrasmall (≤3 nm) bimetallic nanoparticles with controllable compositions and structure are of great interest for their catalytic activity, especially carbon dioxide reduction. Herein is reported a synthesis for bimetallic AuxCu1-x nanoparticles of tunable composition that takes advantage of complex-ion chemistry. These AuxCu1-x nanoparticles exhibit ultrasmall sizes (∼2 nm), and the observed metal compositions are similar to the nominal metal ratios in the synthesis, roughly 3:1, 1:1, and 1:3 for Au:Cu. The nanoparticles appear to be disordered alloys; no evidence for intermetallic compositions was obtained. Oxidation state analysis of Cu was carried using XPS; after 1 day, only minor oxidation of copper was observed. The original capping agent for the nanoparticles, dodecanethiol, is complexed with sodium dodecyl sulfate to transfer the particles to the aqueous phase.
AB - Ultrasmall (≤3 nm) bimetallic nanoparticles with controllable compositions and structure are of great interest for their catalytic activity, especially carbon dioxide reduction. Herein is reported a synthesis for bimetallic AuxCu1-x nanoparticles of tunable composition that takes advantage of complex-ion chemistry. These AuxCu1-x nanoparticles exhibit ultrasmall sizes (∼2 nm), and the observed metal compositions are similar to the nominal metal ratios in the synthesis, roughly 3:1, 1:1, and 1:3 for Au:Cu. The nanoparticles appear to be disordered alloys; no evidence for intermetallic compositions was obtained. Oxidation state analysis of Cu was carried using XPS; after 1 day, only minor oxidation of copper was observed. The original capping agent for the nanoparticles, dodecanethiol, is complexed with sodium dodecyl sulfate to transfer the particles to the aqueous phase.
KW - CO reduction
KW - bimetallic nanoparticles
KW - gold-copper
KW - tunable composition
KW - two-phase synthesis
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U2 - 10.1021/acsanm.9b00904
DO - 10.1021/acsanm.9b00904
M3 - Article
AN - SCOPUS:85068594068
VL - 2
SP - 3989
EP - 3998
JO - ACS Applied Nano Materials
JF - ACS Applied Nano Materials
SN - 2574-0970
IS - 6
ER -