Porous WS₂ and W₂N powders by hard templating with colloidal silica

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• 作者：P. Gibot^a ; ^{pierre.gibot@isl.eu" class="auth_mail" title="E-mail the corresponding author} ; J. Parmentier^b ; ^{julien.parmentier@uha.fr" class="auth_mail" title="E-mail the corresponding author} ; L. Vidal^b ; ^{loic.vidal@uha.fr" class="auth_mail" title="E-mail the corresponding author} ; F. Schnell^a ; ^{fabien.schnell@isl.eu" class="auth_mail" title="E-mail the corresponding author} ; H. Nouali^b ; ^{habiba.nouali@uha.fr" class="auth_mail" title="E-mail the corresponding author} ; D. Spitzer^a ; ^{denis.spitzer@isl.eu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Tungsten disulfide ; Tungsten nitride ; Surface properties ; Colloidal silica ; Hard-template
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：1443-1448
• 全文大小：1328 K

文摘

Meso- and macroporous tungsten disulfide (WS₂) and tungsten nitride (W₂N) powders were successfully synthesized by reduction of [WO₃/colloidal silica] composites under hydrogen sulfide and ammonia gases respectively. The colloidal silica, marketed as Ludox^®, was used as a hard template and its removal from the composite led to a porosity release. The products were characterized by X-ray diffraction, nitrogen adsorption, mercury porosimetry and electron microscopy. Well-crystallized samples with specific surfaces areas close to ~40 m² g⁻¹ were thus synthesized. The present approach might be easily extended to the synthesis of other nitrides and sulfides materials.