Theoretical Model to Compute Specific Area of Activated Carbon

在分析比较各种吸附理论的基础上,介绍5种可用于计算活性炭比表面积的吸附等温方程式,并实际计算6种不同类型活性炭的比表面积.结果表明:不同吸附等温式之间的差异在16%以内.Adsorption isothem equations which are suited to calculate the specific area of activated carbon are recommended based on the analysis and the comparison of various adsorptive theoriesThe specific areas of six activated carbons of different types are computerd by beans of five adsorption isothem equations separatelyThe results showed that the maximum deviation within 16% among calculation values of six carbons in terms of five different adsorptive models国家自然科学基金资助项目(30271057)

Effect of Ti-Si Mixed Oxide Support on Gold Catalysts for Gas-Phase Epoxidation of Propylene

以TiCl4和SiCl4为原料,采用水解和非水水解溶胶-凝胶两种方法制备了一系列不同Ti含量的Ti-Si复氧化物载体,继而用沉积-沉淀法制得载金催化剂.采用X射线衍射、紫外-可见漫反射光谱、N2吸附和高分辨透射电镜对催化剂进行了表征,并考察了催化剂在氢气和氧气存在下的丙烯气相环氧化催化性能.研究表明,钛含量在6%~14%范围内时,两种方法制得的Ti-Si复氧化物均为无定形结构,但采用非水水解溶胶-凝胶法制得的载体比表面积较高.以非水水解溶胶-凝胶法制备的钛含量10%的Ti-Si复氧化物为载体得到的载金催化剂表现出较高的活性和选择性,反应60min时,丙烯转化率为5.7%,240min后降为3.3%,环氧丙烷的选择性稳定于95%左右.还考察了非水水解溶胶-凝胶的陈化时间和金沉积-沉淀溶液的pH值等对反应结果的影响.Titania-silica mixed oxides prepared by hydrolytic and one-step non-hydrolytic sol-gel routes using TiCl_4 and SiCl_4 as precursors were employed as the gold catalyst supports for gas-phase epoxidation of propylene in O_2 and H_2. Characterization studies of the supports and catalysts were performed by means of X-ray diffraction, ultraviolet-visible absorption spectroscopy, N_2 adsorption, and high-resolution transmission electron microscopy. The results indicated that the amorphous Ti-Si mixed oxides containing 6%-14% of Ti could be prepared by both sol-gel routes, but those by non-hydrolytic sol-gel afforded higher surface area and significant mesopores. A superior catalytic performance was obtained with the gold catalyst supported on the non-hydrolytic sol-gel Ti-Si mixed oxide containing 10% of Ti. The propylene conversion was 5.7% at the initial 60 min and 3.3% at 240 min of time on stream. The selectivity for propylene oxide was as high as 95%. The influences of aging time for the non-hydrolytic sol-gel and pH value for the Au deposition-precipitation on the performance of the Au catalyst were also discussed.国家自然科学基金(20021002,20473065,20433030);; 福建省科技重大专项(2005HZ01-3)资助项目

XPS Analysis of the HgCdTe Surface Etched by ICP

文章将ICP刻蚀技术应用于刻蚀HgCdTe,使用微区X射线光电子光谱学(XPS)、扫描电子显微镜(SEM)等表面分析技术研究了ICP各工艺参数,包括ICP功率、气体成分与配比、腔体压力等对刻蚀表面形貌、刻蚀后表面成分、聚合物形成的影响。XPS分析结果发现,使用光刻胶作掩模时,刻蚀气体CH4会与光刻胶发生反应,生成物可能为C6H5(CH3)。如果腔体压力较高,生成物不能及时被带走,就会附着在样品表面上,使样品表面发黑;当腔体压力较低时,生成物被及时带走,则样品表面光亮,无聚合物残留。光刻胶也会与H2发生反应,生成多种含C有机物。SiO2作掩模时,在一定的条件下,CH4会与SiO2或者真空硅脂发生反应,生成聚脂薄膜。ICP(Inductively Coupled Plasma) etching technique has been applied to HgCdTe providing significant benefits such as high uniformity, low damage and anisotropic profile,etc.We have studied the dependence of surface profile,post-etch composition,formation of polymer on the effect of ICP parameters(ICP power,gas ratio,chamber pressure) by using micro regional XPS and SEM(scanning electron microscopy).We have found that methane can react with photoresist(PR) which is used as mask,the product may be C_6H_5(CH_3).The product can't be pumped out if the chamber pressure is high,then it will be left on the sample surface forming so-called polymer.Otherwise if the chamber pressure is low,the product is pumped away the chamber in time,and there is no polymer on the surface.H_2 can react with PR,and the products are several organic compounds with carbon.Under certain condition,methane can reacts with SiO_2 or high vacuum grease,generating Mylar Polyster

Alloy Conditions Impact on Al/n~+-Ge Ohmic Contact

gE比SI具有更高的电子和空穴迁移率,且gE材料可以应用于1.3~1.5μM近红外波段,因此gE成为制备微电子和光电子器件的主要材料。然而由于gE的费密能级钉扎效应以及难以获得高浓度的磷(P)原位掺杂,使得n-gE的欧姆接触成为一个难题。采用P+离子注入获得高掺杂浓度的n-gE材料,掺杂浓度为1.5x1019CM-3;依据圆形传输线模型(CTlM)制备了一系列Al/n+-gE样品,研究了不同退火温度和退火方式对其接触特性的影响。实验结果表明,Al/n+-gE样品通过400℃快速热退火(rTA)30 S表现出欧姆接触特性,并且接触电阻率ρC最低,为1.3x10-5Ω·CM2。Germanium is used as the primary material on the micro-or opto-electronic devices,due to the much higher electron and hole mobility compared to Si,as well as its favorable absorption coefficient in the near infrared wavelength regime(1.3-1.5 μm).However,the ohmic contact formation on n-type Ge is still a challenge because of the severe Fermi level pinning effect of n-Ge and the low concentration of P-situ doping.Heavily-doped n-type Ge was achieved with phosphorus concentration of 1.5×1019cm-3 by the ion implantation.And then a series of Al/n+-Ge samples were prepared according to circular transmission line model(CTLM).The samples were annealed at different temperatures and with different annealing ways to analyze the contact characteristics.The test result indicate that the Al/n+-Ge contacts show ohmic characteristics by rapid thermal annealing(RTA) at 400 ℃ for 30 s,with the lowest contact resistivity ρc of 1.3×10-5 Ω·cm2.国家自然科学基金资助项目(61176050;61036003;61176092;60837001); 国家重点基础研究发展计划资助项目(2012CB933503;2013CB632103); 福建省基础研究基金资助项目(2012H0038); 中央高校基本科研基金资助项目(2010121056

GaN LED/metals/Si structure fabricated by bonding and laser-lift off

采用金属键合技术结合激光剥离技术将gAn基lEd从蓝宝石衬底成功转移到SI衬底上。利用X射线光电子谱(XPS)研究不同阻挡层对Au向gAn扩散所起的阻挡作用,确定键合所需的金属过渡层。利用多层金属过渡层,在真空、温度400℃和加压300 n下实现gAn基lEd和SI的键合,通过激光剥离技术将蓝宝石衬底从键合结构上剥离下来,形成gAn基lEd/金属层/SI结构。用金相显微镜及原子力显微镜(AfM)观察结构的表面形貌,测得表面粗糙度(rMS)为12.1 nM。X射线衍射(Xrd)和rAMAn测试结果表明,衬底转移后,gAn基lEd的结构及其晶体质量没有发生明显变化,而且gAn与蓝宝石衬底间的压应力得到了释放,使得SI衬底上gAn基lEd的电致发光(El)波长发生红移现象。The effect of different barrier layers on gold diffusing into GaN is analyzed by X-ray photoelectron spectroscopy(XPS).By using wafer bonding and laser lift-off(LLO),which uses a KrF excimer laser(248 nm) to separate GaN LED from sapphire substrate,an light emitting diode(LED) GaN epi layer is successfully transferred onto a Si substrate at the temperature of 400 ℃.The surface of samples after laser lift-off(LLO) is observed with microscope and atomic force microscope(AFM).The root-mean-square roughness of the transferred GaN LED surface is about 12.1 nm.The X-ray diffraction(XRD) and Raman test results show that the quality of LED on Si substrate has not obviously change,but the electroluminescence peak wavelength of GaN-based LED on Si substrate showes a red shift compared to that on sapphire substrate.国家自然科学基金重点基金资助项目(60837001);福建省自然科学基金资助项目(2008J0221);福建省教育厅科技项目(JB08215

Honeycomb-Patterned Hybrid Films and Their Template Applications via A Tunable Amphiphilic Block Polymer/Inorganic Precursor System

通讯作者地址: Li,L(通讯作者),Xiamen Univ,Coll Mat, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, Coll Mat, Xiamen 361005, Peoples R China 2. Xiamen Univ, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 3. Chinese Acad Sci, Shanghai Inst Organ Chem, Shanghai 200032, Peoples R China 电子邮件地址: [email protected], we show a facile and versatile method-prepare highly ordered inorganic patterns on solid substrates by pyrolyzing UV cross-linked polymr/functional. precursor hybrid films. The crosslinked polymer matrix acted as structure-directing agent in a pyrolyzing process, whereas the functional precursor was converted into the skeleton of the micropatterns. The inorganic micropatterns could be further catalytically functionalized to grow CNT and ZnO nanorod arrays by simply changing different functional precursors. This simple technique offers new prospects in the field of micropatterns, nanolithography, and template.National Natural Science Foundation of China,50703032,20974089;Natural Science Foundation of Fujian Province,2009J06029; Ministry of Education of Chin

异丁烷氧化脱氢制异丁烯催化剂的研究

学位：理学硕士院系专业：化学化工学院化学系_物理化学(含化学物理)学号：1991360

Tidal front around the Hainan Island, northwest of the South China Sea

[1] As the coastal fronts being detected by the SeaWiFS-derived Chl-a concentrations and AVHRR-derived SST images, a three-dimensional primitive equation numerical model is used to study the physical mechanisms for the formation of fronts around the Hainan Island, northwest of the South China Sea. Several monthly averaged SeaWiFS-derived Chl-a concentrations indicate that higher Chl-a zones usually exist along the coasts of the Zhanjiang Peninsula, the Beibu Gulf (or the Gulf of Tonkin) and the Hainan Island. Obvious surface Chl-a fronts can thus be seen narrowly adjacent to the higher Chl-a zones. AVHRR-derived SST images indicate several other fronts that have a large seasonal variation. The SST fronts are formed in the Beibu Gulf and in the northeastern area off the Hainan Island in winter. The numerical modeling of seven major tidal constituents (M-2, S-2, K-1, O-1, P-1, N-2, and K-2) indicates that two high kinetic energy zones appear in the Qiongzhou Strait and near the southwestern coast of the Hainan Island. The value of log (h/u(3)), where h is depth in meter and u is the depth-mean tidal current in m/s, is calculated to predict the frontal position. It is indicated that the locations of contour lines log (h/u(3)) = 2.9 similar to 3.0 are in good agreement with the frontal positions detected by the satellite observations. Therefore these Chl-a fronts can be considered to be mainly induced by the tidal mixing while the monsoon wind, solar radiation, and coastal dynamics may play an important role for the seasonal variation of several other fronts

Study on Silicides in Cuticle of Rice Straw by Means of XPS(Ⅰ)

对稻草茎部和叶鞘的外表面及穗轴等进行了皮层硅化物的X射线光电子能谱(XPS)研究。结果表明,所研究的几个部位皮层中,自外至里,硅化物的含量及分布具有相同的规律性;茎部皮层外表面硅化物的含量(面积)最低,但半峰宽则比皮层内部高;叶鞘及穗轴的皮层外表面硅化物的含量及半峰宽均比其皮层内部低。初步测定表明,所有部位中的硅化物均为无机硅化物,不同部位硅化物的组成不同;但各测定点的半峰宽都明显高于基准值1.57,说明在测定范围内的硅化物均是由两种或两种以上的硅化物组成的。因此,对各部位的S I2P峰均需进行分峰拟合分析才能得到正确的结果。The silicides in the outer surface cuticle of rice straw stem and leaf sheath as well as the cuticle of rice shaft were researched by means of XPS.The results showed that the content profile of silicides in the above parts of rice stem are in the same pattern.The outer surface of the rice stem cuticle has the lower silicide content and higher full-width at half-maximum(FWHM) than that in the inner cuticle layers.The outer-surfaces of cuticle of leaf sheath and rice shaft show lower silicide content and FWHM than that in the inner layers of the cuticle.Our preliminary studies showed that all silicides are inorganic silicides but they have different composition in different parts of rice straw.Because of the FWHM of the Si2P peaks of the tested samples is obviously higher than the standard value of 1.57,the silicides in all above parts must be consisted of two or more than two sorts of silicides,and all Si2P peaks have to be further demonstrated by peak-differentating and imitating analysis.国家自然科学基金(20277012)资助项

Study on Silicides in Cuticle of Rice Straw by Means of XPS(Ⅱ)

用XPS测定结合分峰拟合分析,研究稻草茎部、叶鞘、穗轴等部位皮层中硅化物的组成。结果表明,在实验范围内,各部位中的硅化物均由有机硅化物和无机硅化物组成,但都以无机硅化物为主,并且不同部位中硅化物的组成有明显的差异,无机硅化物与有机硅化物的比例也不同。测定出的无机硅化物主要有5种形式的SIO2、钠沸石、nA2SIf6、滑石、高岭土、硅灰石、分子筛型物质及富铝红柱石等;有机硅化物中主要是PH3SI-O-SIPH3、ET3SICl、ET2SICl2、ETSICl3、ET3SIbr、树脂及线状P-METHylSIl等。The silicide components in cuticle of rice straw stem,leaf sheath and rice shaft were studied by means of XPS-peak-differentation-imitating analysis.The results showed that,under experimental conditions,the silicides in every above part are composed of inorganic and organic silicides,and the ratio of inorganic silicides to organic silicides are distinctly different from each other.And most of the silicides are inorganic.Silicides including five kinds of SiO2,the Vycor,quartz,alpha cristabal and gel,and many other inorganic silicides,e.g.Ca3Si3O9,Natrollite,Na2SiF6,Talc,Kaolinite,several sorts of Mol.Sieve,Al2SO5 etc.Meanwhile there are many sorts of organic silicides such as Ph3Si-O-SiPh3,Et3SiCl,Et2SiCl2,EtSiCl3,p-Methylsil(linear and resin),etc.国家自然科学基金(20277012)资助项