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tata880214木蟲 (小有名氣)
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[求助]
求助翻譯一段話，中譯英，不要直接google翻譯噢
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圖3為三種金催化劑和載體的紫外-可見吸收光譜圖。據(jù)文獻報道得知，金顆粒因為具有表面等離子體性質(zhì)可以吸收可見光。為了對所制備的不同體系的金催化劑的性質(zhì)進一步了解，我們進行了紫外可見光吸收表征。從UV-Vis圖我們發(fā)現(xiàn)，在沒有負載金之前，無論是ZrO2，Al2O3還是TiO2只能在紫外光（200-400 nm）范圍內(nèi)有部分吸收，在波長>400 nm可見光區(qū)域沒有吸收。當金顆粒負載在這些氧化物載體表面以后，這些氧化物的性能發(fā)生了改變。從紫外可見譜圖中可以明顯的看出，負載金后的催化劑在550 nm處新增了一個范圍較寬的吸收峰。Kowalska等[19]證明，金催化劑在550 nm處上新增加的吸收峰是由于金的表面等離子體共振引起的。當入射光的電場強度和金顆粒導帶電子的震蕩發(fā)生耦合時，會促使金表面局部的電場強度增加，因此金粒子就可以吸收520-550 nm的可見光[20]。與此同時，不同大小的金產(chǎn)生的表面等離子體作用也不一樣[21-22],吸收可見光的范圍也會有所不同。比較三種不同金催化劑的UV-Vis譜圖，可以看出Au/TiO2在550nm處的吸收峰的范圍最寬，吸收可見光的強度也最強。研究報道[23]，金顆粒的形狀，大小，顆粒間的距離等都影響著金顆粒的等離子體耦合作用，并且金顆粒越大，其吸收可見光越強[24]。 此外UV-Vis譜圖還顯示出，Au/TiO2 ,Au/ZrO2具有較高的吸收光的能力。EDS檢測結(jié)果顯示Au/TiO2，Au/ZrO2及Au/Al2O3催化劑Au負載量分別為8.23wt%，8.37wt%，3.12wt%。因此金催化劑的吸收光的能力還和金的負載量有關。金顆粒負載越多，制備得到得金催化劑吸收光的強度越大。 |
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flora_yhy
銀蟲 (正式寫手)
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看著都暈�，F(xiàn)實給兩百大洋會有人考慮吧 
2樓2011-07-21 13:18:31
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3樓2011-07-21 14:14:11
4樓2011-07-21 14:36:49
yerufei_2010
新蟲 (著名寫手)
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【答案】應助回帖
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tata880214(金幣+200, 翻譯EPI+1): 什么時候我才能達到這樣的水平，是不是要多看文獻，謝謝拉 2011-07-21 15:04:35
Mally89(金幣+2): 感謝應助！~歡迎常來！~ 2011-07-23 21:28:39
tata880214(金幣+200, 翻譯EPI+1): 什么時候我才能達到這樣的水平，是不是要多看文獻，謝謝拉 2011-07-21 15:04:35
Mally89(金幣+2): 感謝應助！~歡迎常來！~ 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樓2011-07-21 14:55:02
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