Effect of Hydration Procedure of Fumed Silica Precursor on the Formation of Luminescent Carbon Centers in SiO2:C Nanocomposites. Issue 3 (8th January 2019)

• Record Type: Journal Article
• Authors: Vasin, Andrii; Kysil, Dmytro; Isaieva, Oksana; Rudko, Galyna; Virnyi, Dmytro; Sevostianov, Stanislav; Tertykh, Valentyn; Piryatinski, Yuri P.; Starik, Sergii; Vaccaro, Lavinia; Cannas, Marco; Lysenko, Volodymyr; Nazarov, Alexei
• Other Names: Mescia Luciano guestEditor.; Cannas Marco guestEditor.; Agnello Simonpietro guestEditor.; Gelardi Franco Mario guestEditor.
• Is Part Of: Physica status solidi. Volume 216:Issue 3(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-01-08
• Subjects: carbon clusters -- carbonized fumed silica -- carbonized nanocomposite material -- phenyltrimethoxysilane -- wide‐band visible photoluminescence; Solid state physics -- Periodicals; Solids -- Industrial applications -- Periodicals; 530.41
• DOI: 10.1002/pssa.201800560
• Languages: English
• ISSNs: 1862-6300

Abstract

Abstract : The effect of hydration procedure of fumed silica precursor on photoluminescent properties of carbonized silica (SiO2 :C) nanocomposite after chemo/thermal treatments is studied. Main structural effect is the formation of chemical bonding of phenyl groups to silica surface via multiple CSiO bonding bridges. Synthesized samples demonstrate very broad photoluminescence (PL) bands in near ultraviolet and visible ranges with maximum intensity dependent on temperature of thermal annealing. Two main trends in luminescence properties are: 1) hydration‐induced blue shift of PL in comparison with PL of unhydrated series; 2) red shift of PL bands with increasing synthesis temperature regardless hydration procedure. Temperature dependent evolution of light emission bands is discussed in terms of surface carbon nanoclusters formation and aggregation processes. It is assumed that blue shift of PL bands in the hydrated series is associated with the decreased surface mobility of carbon atoms and clusters as a result of increased chemical bonding with silica surface that slows down carbon thermally stimulated clusterization/aggregation processes. Abstract : Broad band photoluminescence of carbon nanoprcipitates dispersed in fumed silica is studied. The effects of silica surface pretreatment and pyrolysis of PhTMS grafted to silica surface on near UV and VIS emission are discussed in term of surface mobility and surfac.