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Silica-coating-assisted nitridation of TiO_(2) nanoparticles and their photothermal property

Nano Research 2021年第9期14卷 3228-3233页

作者： Qilin Wei Danielle L.Kuhn Zachary Zander Brendan G.DeLacy Hai-Lung Dai Yugang Sun Department of Chemistry Temple University1901 North 13th StreetPhiladelphiaPennsylvania 19122USA U.S.Army Edgewood Chemical Biological Center Research&Technology DirectorateAberdeen Proving GroundMaryland 21010USA

Nanoparticles of refractory compounds represent a class of stable materials showing a great promise to support localized surface plasmon resonances(LSPRs)in both visible and near infrared(NIR)spectral *** is still challenging to rationally tune the LSPR band because of the difficulty to control the density of charge carriers in individual refractory nanoparticles and maintain the dispersity of nanoparticles in the processes of synthesis and *** this work,controlled chemical transformation of titanium dioxide(TiO_(2))nanoparticles encapsulated with mesoporous silica(SiO_(2))shells to titanium nitride(TiN)via nitridation reaction at elevated temperatures is developed to tune the density of free electrons in the resulting titanium-oxide-nitride(TiO_(x)N_(y))*** tunability enables a flexibility to support LSPR-based optical absorption in the synthesized TiO_(x)N_(y)@SiO_(2) core-shell nanoparticles across both the visible and NIR *** silica shells play a crucial role in preventing the sintering of TiO_(x)N_(y) nanoparticles in the nitridation reaction and maintaining the stability of TiOxNy nanoparticles in *** LSPR-based broadband absorption of light in the TiO_(x)N_(y)@SiO_(2) nanoparticles exhibits strong photothermal effect with photo-to-thermal conversion efficiency as high as〜76%.

关键词： titanium-oxide-nitride nanoparticles mesoporous silica coating nitridation reaction structural transformation plasmonic absorption photothermal effect

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Preparation,structure and mechanical properties of Sialon ceramics by transition metal-catalyzed nitriding reaction

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Rare Metals 2020年第5期39卷 589-596页

作者： Qing-Ming Xiong Zhi Chen Jun-Tong Huang Meng Zhang Hui Song Xi-Feng Hou Xi-Bao Li Zhi-Jun Feng School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China Tianjin Boya Dadi New Material Technology Ltd. Tianjin 300382China

Sialon ceramics were prepared by the nitridation of Si,Al and Al2O3 powders with the transition metals(Fe Co,Ni)*** phase composition,microstructure and mechanical properties of specimens were studied Compared with the catalyst-free specimen,the addition of Fe,Co and Ni greatly promoted the nitridation process of Sialon ceramics and improved the weight gain rate and mechanical properties of *** the increased content of catalysts,the apparent porosity of the products decreased first and then increased,contrary to flexural strength and compressive *** specimen with 2.5 wt%Fe had the highest flexural strength 145.8 MPa and it exhibited the highest compressive strength of 594.6 MPa when Co content was 2.5 wt%,whereas they were 71.9 and 78.7 MPa,respectively,when without catalyst.

关键词： Transition metal Sialon Whiskers or fibers nitridation reaction Flexural strength Compression resistance

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