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| 1 | Sol–gel synthesis of mesoporous mixed Fe 2 O 3 /TiO 2 photocatalyst: Application for degradation of 4-chlorophenol显示文摘 | B. Palanisamy C.M. Babu B. Sundaravel S. Anandan V. Murugesan | 2013 | Journal of Hazardous Materials2013,,: | 2 |
| 2 | Al-MCM-48分子筛对苯酚与乙酸异丙酯异丙基化反应的催化性能(英文)显示文摘Al-MCM-48 molecular sieves (Si/Al molar ratios = 25, 50, 75, and 100) were synthesized hydrothermally using cetyltrimethyl-ammonium bromide as the structure directing template. The orderly arrangement of mesopores was evident from the low angle X-ray diffraction patterns and transmission electron microscopy images. The catalytic performance of the materials was evaluated in the vapor phase isopropylation of phenol with isopropyl acetate. Phenol conversion decreased with the increase in the Si/Al ratio of the catalysts. The major reaction product was 4-isopropyl phenol with 78% selectivity. The delocalization of phenolic oxygen electron pair over the aromatic ring promoted para-selective alkylation. Such delocalization could be aided by the hydrophilic surface of the molecular sieves. Although an ester was used as the alkylating agent, phenyl isopropyl ether was not formed in the reaction. | Kandan VENKATACHALAM Pitchai VISUVAMITHIRAN Balachandran SUNDARAVEL Muthiapillai PALANICHAMY Velayutham MURUGESAN | 2012 | 催化学报2012,33,3: | 2 |
| 3 | Tribological properties of N+ion implanted ultrananocrystalline diamond films显示文摘 | PANDA K KUMAR N PANIGRAHI B K POLAKI S R SUNDARAVEL B DASH S TYAGI A K LIN I N | 2013 | Tribology International2013,57,: | 1 |
| 4 | 退火对大剂量Al离子注入GaN发光特性的影响显示文摘首次报道了用不同浓度的Al离子注入于蓝宝石衬底上的GaN薄膜(注入能量为500keV、注入浓度为1014~1015 cm-2), 在做了不同温度和不同时间的快速热退火处理以及常规热退火处理后,在12K下用He-Cd 激光(325nm)激发得到其发射谱。结果显示, 经大剂量Al注入后的样品,其光致发光谱中3.45eV的带边激子发光以及2.9 ~ 3.3eV的4个声子伴随峰消失。此表明大剂量Al注入对GaN的晶体结构造成严重的损伤,以致本征发光消失。经1014cm-2剂量Al注入后的样品,在N2气氛中退火处理后,2.2eV缺陷发光峰得到了一定程度的恢复。而且,经常规退火处理后,此发射峰比快速退火处理的样品发射峰恢复得更好(其积分光强高3倍)。相似的结果亦显示于1015 cm-2 浓度的Al 注入的样品。2.2eV 黄色荧光源于GaN的缺陷(如Ga空位(VGa), 或VGaH2,或VGa-ON 复合体),其能级位于价带顶以上约1.1eV处。荧光发射可以来自'导带缺陷能级'的跃迁,也可能来自浅施主(如N位O,能级位于导带下~10 meV)至上述缺陷能级之间的跃迁。I-V 测量显示,Al的注入区成为 ~ 10? | 许小亮 施朝淑 陈永虎 Luo E Z Sundaravel B Wilson I H | 2002 | 液晶与显示2002,17,2: | 1 |
| 5 | Synthesis, structures, spectral and electrochemical properties of cop- per(Ⅱ) complexes of sterically hindered Schiff base lig- ands 显示文摘 | Sundaravel K Suresh E Palaniandavar M | 2009 | Inorg China Acta2009,362,: | 1 |
| 6 | Two-photon polymerization initiators for three-dimensional optical data storage and microfabri- cation显示文摘 | Cumpston B H Sundaravel P Marder S R | | 0,,: | 1 |
| 7 | Sol-gel synthesis of mesoporous mixed Fe203/TiO2 photoeatalyst: Application for degradation of 4-chlorophenol 显示文摘 | Palanisamy B Babu C M Sundaravel B | 2013 | Journal of Hazardous Materials2013,,: | 1 |
| 8 | Sol-gel synthesis of mesoporous mixed Fe2O3/TiO2photocatalyst:Application for degradation of 4-chlorophenol显示文摘 | PALANISAMY B BABU CM SUNDARAVEL B | 2013 | Journal of Hazardous Materials2013,252,: | 1 |
| 9 | 退火对离子注入GaN产生的深能级的影响显示文摘我们最近报道了大剂量Al+注入原生GaN后对其光学性质的影响。表明Al+的注入可能产生了某种深能级电子陷阱 ,由于电子陷阱俘获导带电子 ,导致发光猝灭。而经一定条件的退火处理 ,可使深的电子陷阱发生变化 ,因而与缺陷间的跃迁相关的黄色荧光可得到一定程度的恢复。由于注入样品的电阻率高达 1 0 1 2 Ω·cm ,因此不能用已有的常规方法测量。我们为此发展了一种称为“光增强电流谱”(PSCS)新方法 ,用于测量高阻样品中的深能级。研究发现 ,在经过快速退火处理的样品中 ,不能消除由于注入产生的准连续深能级带 ;而在某种常规条件退火的样品中 ,发现了 5个位于导带下 1 .77eV ,1 .2 4eV ,1 .1 6eV ,0 .90eV和 0 .86eV的深电子陷阱 ,它们都是Al+注入经退火后形成的稳定结构。实验发现退火使注入产生的准连续深能级带转变为独立的深能级结构 ,虽不能使GaN的本征发光得到恢复 ,但对黄色荧光的恢复是有利的。此研究有助于了解退火处理对离子注入的GaN的电学结构与发光产生的影响。PSCS的意义在于它适用于测量一切高阻半导体样品中与非辐射跃迁相联系的深陷阱能级 。 | 许小亮 何海燕 刘洪图 施朝淑 葛惟昆 Luo E Z Sundaravel B Wilson I H | 2002 | 液晶与显示2002,17,4: | 0 |