A silica sol-gel design strategy for nanostructured metallic materials

Scott C. Warren*, Matthew R. Perkins, Ashley M. Adams, Marleen Kamperman, Andrew A. Burns, Hitesh Arora, Erik Herz, Teeraporn Suteewong, Hiroaki Sai, Zihui Li, Jörg Werner, Juho Song, Ulrike Werner-Zwanziger, Josef W. Zwanziger, Michael Grätzel, Francis J. Disalvo, Ulrich Wiesner

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

100 Citations (Scopus)

Abstract

Batteries, fuel cells and solar cells, among many other high-current-density devices, could benefit from the precise meso-to macroscopic structure control afforded by the silica sol-gel process. The porous materials made by silica sol-gel chemistry are typically insulators, however, which has restricted their application. Here we present a simple, yet highly versatile silica sol-gel process built around a multifunctional sol-gel precursor that is derived from the following: amino acids, hydroxy acids or peptides; a silicon alkoxide; and a metal acetate. This approach allows a wide range of biological functionalities and metals-including noble metals-to be combined into a library of sol-gel materials with a high degree of control over composition and structure. We demonstrate that the sol-gel process based on these precursors is compatible with block-copolymer self-assembly, colloidal crystal templating and the Stöber process. As a result of the exceptionally high metal content, these materials can be thermally processed to make porous nanocomposites with metallic percolation networks that have an electrical conductivity of over 1,000 S cm-1. This improves the electrical conductivity of porous silica sol-gel nanocomposites by three orders of magnitude over existing approaches, opening applications to high-current-density devices.

Original languageEnglish
Pages (from-to)460-467
Number of pages8
JournalNature Materials
Volume11
Issue number5
DOIs
Publication statusPublished - May-2012
Externally publishedYes

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