Coating of Silica and Titania Aerosol Nanoparticles by Silver Vapor Condensation

Juha Harra, Paxton Juuti, Janne Haapanen, Miika Sorvali, Eleftheria Roumeli, Mari Honkanen, Minnamari Vippola, Jaakko Yli-Ojanperä, Jyrki M. Mäkelä

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (Scopus)

    Abstract

    Silica and titania aerosol nanoparticles are coated with silver through a physical coating process. The silver is evaporated in a tubular furnace flow system and condensed on the ceramic carrier particles with diameters of approximately 100nm. The temperature gradient in the furnace system is optimized in order to avoid homogeneous nucleation of the silver. The generated ceramic-silver composite nanoparticles are characterized with aerosol measurements and analytical transmission electron microscopy. Two completely different particle morphologies are clearly observed, silver-decoration and composite doublet, with amorphous silica and crystalline rutile titania as the carrier particles, respectively. The former morphology consists of multiple silver nanodots with diameters of 1-10nm, while in the latter morphology the silver had formed a larger structure with a size comparable to that of the carrier particle. Different shapes are observed in these larger silver structures, such as triangular, rodlike, and hexagonal. Differences in the silver particle migration on the surface of the silica and titania particles is proposed to be the key factor resulting into the two distinct particle morphologies.Copyright 2015 American Association for Aerosol Research

    Original languageEnglish
    Pages (from-to)767-776
    Number of pages10
    JournalAerosol Science and Technology
    Volume49
    Issue number9
    DOIs
    Publication statusPublished - 2 Sep 2015
    Publication typeA1 Journal article-refereed

    Keywords

    • LIQUID FLAME SPRAY
    • LOW-PRESSURE IMPACTOR
    • GAS-PHASE
    • PARTICLES
    • CATALYST
    • DEPOSITION
    • SIZE
    • ALUMINA
    • GROWTH
    • PARAMETERS

    Publication forum classification

    • Publication forum level 2

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