Assembling PNIPAM-Capped Gold Nanoparticles in Aqueous Solutions

Nayak, Binay P.; Kim, Hyeong Jin; Nayak, Srikanth; Wang, Wenjie; Bu, Wei; Mallapragada, Surya K.; Vaknin, David

doi:10.1021/acsmacrolett.3c00617

Assembling PNIPAM-Capped Gold Nanoparticles in Aqueous Solutions

Journal Article · Tue Nov 21 23:00:00 EST 2023 · ACS Macro Letters

DOI:https://doi.org/10.1021/acsmacrolett.3c00617· OSTI ID:2223095

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Ames Laboratory, and Iowa State University, Ames, IA (United States)
Ames Laboratory (AMES), Ames, IA (United States)
University of Chicago, IL (United States)

Employing small-angle X-ray scattering (SAXS), we explore the conditions under which assembly of gold nanoparticles (AuNPs) grafted with the thermosensitive polymer poly(N-isopropylacrylamide) (PNIPAM) emerges. We find that short-range order assembly emerges by combining the addition of electrolytes or polyelectrolytes with raising the temperature of the suspensions above the lower-critical solution temperature (LCST) of PNIPAM. Here our results show that the longer the PNIPAM chain is, the better organization in the assembled clusters. Interestingly, without added electrolytes, there is no evidence of AuNPs assembly as a function of temperature, although untethered PNIPAM is known to undergo a coil-to-globule transition above its LCST. This study demonstrates another approach to assembling potential thermosensitive nanostructures for devices by leveraging the unique properties of PNIPAM.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Science Foundation (NSF)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2223095

Alternate ID(s):: OSTI ID: 2572960

Report Number(s):: IS-J--11,206

Journal Information:: ACS Macro Letters, Journal Name: ACS Macro Letters Vol. 12; ISSN 2161-1653

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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