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| Titel: |
Ion-Induced Nucleation in Nanoparticle Synthesis by Ionization Chemical Vapor Deposition |
| Auteur: |
Adachi, Motoaki Kusumi, Masataka Tsukui, Shigeki |
| Verschenen in: |
Aerosol science and technology |
| Paginering: | Jaargang 38 (2004) nr. 5 pagina's 496-505 |
| Jaar: |
2004-05 |
| Inhoud: |
Particle formation mechanisms in nanoparticle synthesis by ionization chemical vapor deposition (CVD), in which source gases are ionized before being fed into the reactor, were investigated experimentally. First, nonagglomerated nanoparticles were formed from a tetraethylorthosilicate (TEOS)/O2 mixture ionized with a sonic-jet ionizer at various furnace temperatures, Tf, and TEOS concentrations, NTEOS. Then, the electrical mobility of the nanoparticles and ions were measured using a differential mobility analyzer combined with a Faraday cup electrometer, and the particle number concentration by a condensation nucleus counter. Measurements at 293 ≤ Tf ≤ 1173 K and 0 ≤ NTEOS ≤ 1.38 × 10-5 mol/l showed that (a) negative TEOS and TEOS cluster ions were formed at Tf = 293 K, (b) gas-phase intermediates forming nanoparticles were formed at Tf ≥ 673 K, (c) for Tf = 873 K condensation of the intermediates onto ions (i.e., ion-induced nucleation) started at NTEOS ≥ 4.48 × 10-7 mol/l, and (d) the growth from ions to nanoparticles was discontinuous for this change in NTEOS. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 3 van 11 gevonden artikelen
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