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首页> 外文期刊>ACS applied materials & interfaces >Enhanced Photocatalytic Activity of Diamond Thin Films Using Embedded Ag Nanoparticles
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Enhanced Photocatalytic Activity of Diamond Thin Films Using Embedded Ag Nanoparticles

机译：使用嵌入式Ag纳米颗粒增强金刚石薄膜的光催化活性

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摘要

Silver nanoparticles embedded into the diamond thin-'filnis enhance the optical absorption and the photocatalytic activity toward the solvated electron-initiated reduction of N2 to NH3 in water. Here, we demonstrate the formation of diamond films with embedded Ag nanoparticles" 100 nm in diameter. Cross-sectional scanning electron microscopy (SEM), energy-dependent SEM, and,energy-. dispersive X-ray analysis demonstrate the formation of encapsulated nanoparticles. Optical absorption measurements in the visible and Ultraviolet region show that the :resulting films exhibit plasmonic resonances in the visible and near-ultraviolet region. Measurements of photocatalytic activity using suprabafid gap (.lambda 225 nm.) and sub-band gap (lambda 225 nm) excitation show significantly enhanced ability to convert N-2 to NH3. corporation of Ag nanoparticles induces a nearly 5-fold increase in activity using-a, sub-band gap excitation with 2 226 nm. Our results suggest that internal photoemission, in which electrons are excited from Ag into diamond's conduction band, is an impottant prOceSS that extends the wavelength region-beyond diamond's band gap. Other factors, including Ag-induced optical scattering and formation of graphitic impurities are also discussed.
机译：嵌入金刚石中的银纳米颗粒薄-'Filnis增强了朝向水中溶剂化的电子引发的N 2至NH 3的光催化活性的光学吸收和光催化活性。在这里，我们证明了具有嵌入式Ag纳米颗粒的金刚石膜的形成“直径为100nm。横截面扫描电子显微镜（SEM），能量相关的SEM，和能量 - 。分散X射线分析证明了形成的形成封装的纳米颗粒。可见和紫外区域中的光学吸收测量结果表明：所得薄膜在可见和近紫外区域中表现出等离子体共振。使用Suprabafid间隙（.lambda 225nm。）和子带的光催化活性测量间隙（Lambda＆ 225nm）激发显示显着提高了转化N-2至NH3的能力。Ag纳米颗粒的公司使用-a，子带间隙激发的活性近5倍，用2＆ 226nm。我们的研究结果表明，内部光电调查，其中电子从AG激发到金刚石的传导频带中，是一种不推断的过程，其延伸了波长区域 - 超出钻石的带隙。其他因素还讨论了Ding Ag诱导的光散射和基质杂质的形成。

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