Size control of Au NPs supported by pH operation

Masumi Ichiji, Hiroko Akiba, Izumi Hirasawa

    Research output: Contribution to journalArticle


    Au NPs are expected to become useful functional particles, as particle gun used for plant gene transfer and also catalysts. We have studied PSD (particle size distribution) control of Au NPs by reduction crystallization. Previous study found out importance of seeds policy and also feeding profile. In this paper, effect of pH in the reduction crystallization was investigated to clarify the possibility of Au NPs PSD control by pH operation and also their growth process. Au NPs of size range 10-600. nm were obtained in single-jet system using ascorbic acid (AsA) as a reducing agent with adjusting pH of AsA. Au NPs are found to grow in the process of nucleation, agglomeration, agglomeration growth and surface growth. Au NPs tend to grow by agglomeration and become larger size in lower pH regions, and to grow only by surface growth and become smaller size in higher pH regions.

    Original languageEnglish
    JournalJournal of Crystal Growth
    Publication statusAccepted/In press - 2016 Aug 2


    • A2. Growth from solutions
    • A2. Industrial crystallization
    • B1. Metals

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Inorganic Chemistry
    • Materials Chemistry

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