POS6-1551
Acid-Medium-Controlled Loading and Nanoparticle Formation of Ni and Cu in Vertically Oriented P4VP Nanodomains
When and Where
Nov 30, -0001
00:00 - 00:00
Room 301 (Grand Ballroom)
Presenter(s)
JIEUN LEE (Chungnam National University)
Co-Author(s)
Abstract
Multimetallic alloy nanocatalysts exhibit composition-dependent electronic structures and surface reactivities, enabling diverse electrochemical applications. Extending the block copolymer nanoreactor approach toward high-entropy alloy (HEA) nanocatalysts requires a loading strategy capable of accommodating chemically distinct metal precursors within confined nanoscale domains. Block copolymers self-assemble into periodic nanodomains that can serve as nanoreactors for domain-selective precursor uptake and nanoparticle formation. Here, vertically oriented poly(4-vinylpyridine) (P4VP) nanodomain arrays were prepared from polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) thin films by solvent vapor annealing (SVA). The loading and particle formation behaviors of Ni and Cu precursors were investigated to broaden the compositional design space of multimetallic catalysts.
In the conventional HCl-based process, protonation of the pyridine moieties and swelling of the P4VP domains enabled the selective loading of several metal precursors. In contrast, Ni and Cu precursor uptake was insufficient, and no corresponding nanoparticles were formed. Acidic media with different acid identities and concentrations were therefore screened. Acetic-acid-based conditions enabled Ni and Cu precursor loading and nanoparticle formation along the vertically oriented nanodomain array. These results identify acid identity and concentration as key processing variables governing precursor compatibility with P4VP nanoreactors.
This study establishes nanoparticle formation conditions for Ni and Cu that were difficult to achieve using the conventional HCl-based process and expands the range of metal elements compatible with PS-b-P4VP nanoreactors. Element-specific selection of acidic media provides a practical basis for future multimetallic alloy and HEA nanocatalyst synthesis.
In the conventional HCl-based process, protonation of the pyridine moieties and swelling of the P4VP domains enabled the selective loading of several metal precursors. In contrast, Ni and Cu precursor uptake was insufficient, and no corresponding nanoparticles were formed. Acidic media with different acid identities and concentrations were therefore screened. Acetic-acid-based conditions enabled Ni and Cu precursor loading and nanoparticle formation along the vertically oriented nanodomain array. These results identify acid identity and concentration as key processing variables governing precursor compatibility with P4VP nanoreactors.
This study establishes nanoparticle formation conditions for Ni and Cu that were difficult to achieve using the conventional HCl-based process and expands the range of metal elements compatible with PS-b-P4VP nanoreactors. Element-specific selection of acidic media provides a practical basis for future multimetallic alloy and HEA nanocatalyst synthesis.
