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tata880214木虫 (小有名气)
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[求助]
求助翻译一段话，中译英，不要直接google翻译噢
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图3为三种金催化剂和载体的紫外-可见吸收光谱图。据文献报道得知，金颗粒因为具有表面等离子体性质可以吸收可见光。为了对所制备的不同体系的金催化剂的性质进一步了解，我们进行了紫外可见光吸收表征。从UV-Vis图我们发现，在没有负载金之前，无论是ZrO2，Al2O3还是TiO2只能在紫外光（200-400 nm）范围内有部分吸收，在波长>400 nm可见光区域没有吸收。当金颗粒负载在这些氧化物载体表面以后，这些氧化物的性能发生了改变。从紫外可见谱图中可以明显的看出，负载金后的催化剂在550 nm处新增了一个范围较宽的吸收峰。Kowalska等[19]证明，金催化剂在550 nm处上新增加的吸收峰是由于金的表面等离子体共振引起的。当入射光的电场强度和金颗粒导带电子的震荡发生耦合时，会促使金表面局部的电场强度增加，因此金粒子就可以吸收520-550 nm的可见光[20]。与此同时，不同大小的金产生的表面等离子体作用也不一样[21-22],吸收可见光的范围也会有所不同。比较三种不同金催化剂的UV-Vis谱图，可以看出Au/TiO2在550nm处的吸收峰的范围最宽，吸收可见光的强度也最强。研究报道[23]，金颗粒的形状，大小，颗粒间的距离等都影响着金颗粒的等离子体耦合作用，并且金颗粒越大，其吸收可见光越强[24]。 此外UV-Vis谱图还显示出，Au/TiO2 ,Au/ZrO2具有较高的吸收光的能力。EDS检测结果显示Au/TiO2，Au/ZrO2及Au/Al2O3催化剂Au负载量分别为8.23wt%，8.37wt%，3.12wt%。因此金催化剂的吸收光的能力还和金的负载量有关。金颗粒负载越多，制备得到得金催化剂吸收光的强度越大。 |
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2楼2011-07-21 13:18:31
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3楼2011-07-21 14:14:11
4楼2011-07-21 14:36:49
yerufei_2010
新虫 (著名写手)
- 翻译EPI: 27
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- 专业: 金属有机化学
【答案】应助回帖
★ ★
tata880214(金币+200, 翻译EPI+1): 什么时候我才能达到这样的水平，是不是要多看文献，谢谢拉 2011-07-21 15:04:35
Mally89(金币+2): 感谢应助！~欢迎常来！~ 2011-07-23 21:28:39
tata880214(金币+200, 翻译EPI+1): 什么时候我才能达到这样的水平，是不是要多看文献，谢谢拉 2011-07-21 15:04:35
Mally89(金币+2): 感谢应助！~欢迎常来！~ 2011-07-23 21:28:39
| Fig.3 The UV - visible absorption spectra of three gold catalyst and their supports According to the literature that，the gold particles can absorb visible light because of its surface plasmon nature. In order to understand further the prepared different systems of the nature of gold catalysts, UV-visible absorption characterization was carried out. From UV-Vis map we found that, before gold was supported, whether it is ZrO2, Al2O3 or TiO2 only in the UV (200-400 nm) range had partial absorption, there was no absorption at visible light region （λ> 400 nm）. The performance of these oxides has changed When gold particles were supported in the surface of these oxides supports. From UV-visible spectrum can be clearly seen that the supported gold catalyst had a wide range of new peaks at 550 nm. Kowalska et al [19] proved that it was due to surface plasmon resonance. When the electric field intensity of incident light and the gold particles in the shock of the conduction band electron coupling occurs, will lead to a increase of electric field intensity on gold surface, so the gold nanoparticles can absorb 520-550 nm visible light [20]. At the same time, surface plasmon effects produced by different sizes of golds are different [21-22], absorption range of visible light will be different. Comparison of the UV-Vis spectra of three different gold catalysts , we can see that Au/TiO2 the widest absorption peak range at 550nm, and the strongest intensity of the absorption of visible light. Reported [23], the gold particles of the plasma coupling was affected by shape, size, distance between the particles of gold particles，and so on, and the larger gold particles, the stronger the absorption of visible light [24]. In addition, UV-Vis spectra also showed that, Au/TiO2, Au/ZrO2 has a high ability to absorb light. EDS results showed that support of Au/TiO2, Au/ZrO2 and Au Au/Al2O3 catalyst were 8.23wt%, 8.37wt%, 3.12wt%. Therefore, the ability to absorb light of gold catalysts was related to support.The more supported gold particles, the prepared gold catalysts had stronger intensity of absorption of light. |
5楼2011-07-21 14:55:02
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