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 This work was supported by the Chemical Imaging Initiative, a LDRD program at Pacific Northwest National Laboratory (PNNL). PNNL is operated by Battelle for DOE under Contract DE-AC05-76RL01830. A portion of the research was performed using the William R. Wiley Environmental Molecular Sciences Laboratory, a US DOE national scientific user facility sponsored by the DOE's Office of Biological and Environmental Research and located at PNNL. The nanoparticle synthesis and functionalization was also supported NIH 1R01EB013689-01/NIBIB, 1R41EB013520-01, 1R42EB013520-01.