探讨还原氮化后对V2O5薄膜SERS效应的影响。以乙酰丙酮氧钒(C10H14O5V)为V源,采用非水解溶胶-凝胶法制备V2O5凝胶,通过氨气还原氮化V2O5薄膜。利用XRD、FE-SEM、UV-VIS-NIR、RAMAN测试薄膜结构、光学性能及SERS效应。结果表明,氮化后V以氮氧化合物的形式存在,随着氮化温度升高,氮元素逐步替代氧元素。随着氮化温度升高,薄膜上晶粒逐渐增大,成板条状,晶体粒径达25 nm。经600℃还原氮化得到的薄膜的紫外可见近红外区域的吸收率最高,且禁带宽度相对于未氮化时的V2O5薄膜较小。利用R6G作为探针分子研究了薄膜的SERS效应,结果表明氮化温度600 ℃时薄膜具有显著的拉曼增强效应,且高于未氮化时的V2O5薄膜的拉曼增强效果,在620 cm-1处拉曼信号峰强度达485 cps.
Abstract
V2O5 gel was prepared with C10H14O5V as V source by non-hydrolytic sol-gel method,then the V2O5 films was reduction nitriding by ammonia gas.XRD,FE-SEM, UV-VIS-NIR and RAMAN were used to characterize the membrane structure, optical properties and SERS effect.The results showed that with the increase of nitridation temperature, the grain size on the film increased gradually, and the grain development became better and better, and the crystal size reached 25 nm.After 600 ℃ reduction get the thin films, UV visible near infrared region the highest absorption rate, and forbidden band width is smaller than that of V2O5 films without nitriding.R6G was used as the probe molecule to study the SERS effect of thin film, and the results showed that the thin films had significant Raman enhancement effect at the nitridation temperature of 600, which was higher than that of V2O5 thin film without nitridation, and the Raman signal peak strength reached 485 cps at 620 cm-1.
关键词
氮化钒 /
五氧化二钒 /
表面增强拉曼光谱
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Key words
vanadium nitride /
vanadium pentoxide /
SERS
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脚注
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基金
国家自然科学基金(51272066),河北省自然科学基金(E2019209474)和华北理工大学杰出青年基金(JQ201712)
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