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One‐Step Direct Synthesis of SiO 2 –TiO 2 Composite Nanoparticle Assemblies with Hollow Spherical Morphology
Author(s) -
Nguyen Hien Thi Thu,
Habu Teppei,
Ohtani Masataka,
Kobiro Kazuya
Publication year - 2017
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201700253
Subject(s) - nanoparticle , solvent , composite number , chemistry , chemical engineering , morphology (biology) , solvothermal synthesis , methanol , acetic acid , toluene , nanocomposite , yield (engineering) , nanotechnology , materials science , organic chemistry , inorganic chemistry , composite material , biology , engineering , genetics
SiO 2 –TiO 2 composite nanoparticle assemblies with or without alkyl surface modification and bearing a higher‐order hollow spherical morphology were successfully synthesized by a simple, rapid, one‐pot, and single‐step solvothermal method using a precursor solution consisting of n ‐octyl‐Si(OMe) 3 or Si(OEt) 4 , Ti(O i Pr) 4 , o ‐phthalic acid, and acetic acid in methanol. The addition of acetic acid is essential for a high yield of nanoparticle assemblies with hollow spherical morphology and a high content of Si. The Si/Ti atomic ratio in the SiO 2 –TiO 2 composite nanoparticle assemblies was easily controlled by changing the Si/Ti atomic ratio in the precursor solutions. The TiO 2 nanoparticles exhibited good dispersibility in a polar solvent (methanol), while the n ‐octyl‐modified SiO 2 –TiO 2 composite nanoparticle assemblies were readily dispersed in a nonpolar solvent (toluene). Thus, the hydrophilic–lipophilic balance of the SiO 2 –TiO 2 nanoparticle assemblies with hollow spherical morphology was directly controlled by the one‐pot and single‐step solvothermal method.