Cluster formation mechanisms of titanium dioxide during combustion synthesis : Observation with an APi-TOF

Show full item record



Permalink

http://hdl.handle.net/10138/306288

Citation

Fang , J , Wang , Y , Kangasluoma , J , Attoui , M , Junninen , H , Kulmala , M , Petäjä , T & Biswas , P 2017 , ' Cluster formation mechanisms of titanium dioxide during combustion synthesis : Observation with an APi-TOF ' , Aerosol Science and Technology , vol. 51 , no. 9 , pp. 1071-1081 . https://doi.org/10.1080/02786826.2017.1331028

Title: Cluster formation mechanisms of titanium dioxide during combustion synthesis : Observation with an APi-TOF
Author: Fang, Jiaxi; Wang, Yang; Kangasluoma, Juha; Attoui, Michel; Junninen, Heikki; Kulmala, Markku; Petäjä, Tuukka; Biswas, Pratim
Contributor organization: Department of Physics
Date: 2017
Language: eng
Number of pages: 11
Belongs to series: Aerosol Science and Technology
ISSN: 0278-6826
DOI: https://doi.org/10.1080/02786826.2017.1331028
URI: http://hdl.handle.net/10138/306288
Abstract: Few studies reported the formation of Ti-containing clusters in the initial stages of TiO2 flame synthesis. The conversion from synthesis precursor to TiO2 monomers was commonly assumed to take place through global reaction such as thermal decomposition and/or hydrolysis at high temperatures. More recent studies have been able to identify stable intermediates of Ti-containing monomers, most commonly Ti(OH)(4), as the final step before the formation of TiO2. However, no larger Ti-containing cluster formation mechanisms or interactions between these monomers have been tracked. To investigate cluster formation pathways of TiO2 during flame synthesis, Charged clusters were measured in an atmospheric pressure interface time-of-flight (APi-TOF) mass spectrometer. TiO2 nanoparticles were synthesized by adding titanium tetraisopropoxide (TTIP) precursor to a premixed CH4/O-2/N-2 flat flame aerosol reactor. Pure TiO2 clusters were not detected by the APi-TOF. Results from measured mass spectra and mass defect plots show that for positively charged clusters, the abstraction of CH2 groups occurs simultaneously with the clustering of larger intermediate organometallic species. For negatively charged clusters, NOx formation pathways in the flame may play a role during the initial stages of TiO2 formation, since a lot of Ti-containing clusters were attached with nitrate-related species. These research findings provide insights on quantum dot synthesis and molecular doping where rapid dilution of the flame synthesized nanoparticles is needed to better control the particle size and chemical composition. The possible influences of and potential artifacts brought by the dilution system on observing the incipient particle formation in flames were also discussed.
Subject: OXIDE-SILICA NANOCOMPOSITES
CHEMICAL-VAPOR-DEPOSITION
FLAME AEROSOL SYNTHESIS
PARTICLE FORMATION
MASS-SPECTROMETRY
NANOPARTICLES
MOBILITY
REACTOR
GROWTH
TIO2
114 Physical sciences
Peer reviewed: Yes
Usage restriction: openAccess
Self-archived version: acceptedVersion


Files in this item

Total number of downloads: Loading...

Files Size Format View
AST_Jiaxi_2017.pdf 695.1Kb PDF View/Open

This item appears in the following Collection(s)

Show full item record