不同形状的光斑触发砷化镓光导开关

为研究使用不同形状光斑触发光导开关对光电导特性的影响,研制了12 mm间隙的半绝缘砷化镓光导开关,在不同的偏置电压下,使用波长为1 064 nm的不同能量的激光触发光导开关并进行了光电导测试。使用了不同形状的光斑（包括面状、线状和点状光斑）触发光导开关并进行了光电导特性的比较,讨论了触发光参数对光导开关特性的影响。对处于开关电极间不同位置的线状光斑触发特性进行了比较,结果显示,本征光电导和非本征光电导情况下光斑位置对光电流的影响正好相反。     

GaAs衬底温度对液滴外延法生长In液滴的影响

采用液滴外延法在GaAs(001)衬底上生长In液滴,利用原子力显微镜(AFM)对不同衬底温度下生长的样品进行表征,观察其表面形貌.研究表明In液滴的生长对衬底温度十分敏感,随着衬底温度的升高,液滴密度逐渐减小,液滴尺寸逐渐增大.分析了In液滴在不同衬底温度形成过程的物理机制,解释了该实验现象的原因.根据成核理论中最大...     

磷化镍修饰磷掺杂氧化镓可见光催化水分解产氢

以Ga₂O₃半导体为前驱体,用浸渍加低温磷化法制备了P掺杂Ga₂O₃表面修饰Ni₂P光催化剂(x-Ni₂P/Ga₂O₃-P_y,x代表Ni²⁺和Ga₂O₃的物质的量之比,y代表NaH₂PO·H₂O与Ga₂O₃的物质的量之比)。5%-Ni₂P/Ga₂O₃-P₆催化剂展现出在纯水中光催化析氢的高活性,在430 nm光照下的光量子效率为0.22%。机理研究结果表明Ni₂P修饰和P掺杂扩展了催化剂的光响应范围,同时提升了载流子分离迁移效率,其长周期光催化反应稳定性明显优于未磷化催化剂。     

Mg掺杂In2O3-x催化剂光热催化CO2加氢

为提高光热催化CO₂加氢In₂O₃催化剂的催化活性,采用均相水热法制备Mg (OH)₂-In (OH)₃前驱体,通过高温煅烧和H₂-还原处理得到了富含氧空位的Mg掺杂In₂O_3-x(Mg-In₂O_3-x)催化剂。在300℃、常压、可见光照射条件下,CO₂加氢转化为CO的CO₂转化率可达31.20%,CO产生速率为14.22 mmol·g_cat^-1·h^-1,CO选择性为100%。相比于单一In₂O_3-x催化剂,Mg-In₂O_3-x催化剂光热催化CO₂转化率及CO产生速率明显提高,这归因于Mg成功掺杂到In₂O₃晶格中,促进In₂O₃表面氧空位的形成,进而对可见光响应效率大幅提高,并有效减缓光生电子-空穴的复合。     

孔内富氨基的高稳定性铟基金属有机骨架高灵敏电化学传感多巴胺

为设计高稳定性且高灵敏度的纯金属有机骨架(MOF)电化学传感器以检测多巴胺(DA),我们选用铟基 MOF [In(2-NH₃-BDC)(2-NH₂-BDC)]·1.5H₂O(RSMOF-1,RSMOF=resistance switchable metal-organic framework,2-NH₂-H₂BDC=2-氨基对苯二甲酸)修饰玻碳电极(RSMOF-1/GCE)。制备的电极RSMOF-1/GCE的DPV测试结果显示其线性范围为0.990~663 μmol·L^-1、检出限为0.770 μmol·L^-1。在多种干扰物质如尿酸、尿素、葡萄糖和对乙酰氨基酚存在的条件下,RSMOF-1/GCE对 DA仍具有高的选择性。理论模拟结果显示,在RSMOF-1孔道内壁的—NH₂可通过氢键增强与DA分子的相互作用,使RSMOF-1/GCE具有灵敏的电化学传感DA的性能。     

Indium Tribromide-Catalysed Transfer-Hydrogenation: Expanding the Scope of the Hydrogenation and of the Regiodivergent DH or HD Addition to Alkenes

The transfer-hydrogenation as well as the regioselective and regiodivergent addition of H−D from regiospecific deuterated dihydroaromatic compounds to a variety of 1,1-di- and trisubstituted alkenes was realised with InBr₃ in dichloro(m)ethane. In comparison with the previously reported BF₃⋅Et₂O-catalysed process, electron-deficient aryl-substituents can be applied reliably and thereby several restrictions could be lifted, and new types of substrates could be transformed successfully in hydrodeuterogenation as well as deuterohydrogenation transfer-hydrogenation reactions.     

A Xanthene-Based Mono-Anionic PON Ligand: Exploiting a Bulky,Electronically Unsymmetrical Donor in Main Group Chemistry

The synthesis of a novel mono-anionic phosphino-amide ligand based on a xanthene backbone is reported, togetherr with the corresponding Ga^I complex, (PON)Ga (PON = 4-(di(2,4,6-trimethylphenyl)phosphino)-5-(2,6-diisopropylanilido)-2,7-di-tert-butyl-9,9-dimethylxanthene). The solid-state structure of (PON)Ga (obtained from X-ray crystallography) reveals very weak O⋅⋅⋅Ga and P⋅⋅⋅Ga interactions, consistent with a R₂NGa fragment which closely resembles those found in one-coordinate amidogallium systems. Strong N-to-Ga π donation from the amido substituent is reflected in a very short N−Ga distance (1.961(2) Å), while the P⋅⋅⋅Ga contact (3.076(1) Å) is well outside the sum of the respective covalent radii. While the donor properties of the PON ligand towards Ga^I are highly unsymmetrical, oxidation to Ga^III leads to much stronger coordination of the pendant phosphine as shown by P−Ga distances which are up to 20 % shorter. From a steric perspective, the PON ligand is shown to be significantly bulkier than related β-diketiminate systems, a finding consistent with reactions of (PON)Ga towards O-atom sources that proceed without oligomerization. Despite this, the enhanced P-donor properties brought about by oxidation at gallium are not sufficient to quench the reactivity of the highly polar Ga−O unit. Instead, intramolecular benzylic C−H activation is observed across the Ga−O bond of a transient gallanone intermediate.     

Ni2P Nanoalloy as an Air-Stable and Versatile Hydrogenation Catalyst in Water: P-Alloying Strategy for Designing Smart Catalysts

Non-noble metal-based hydrogenation catalysts have limited practical applications because they exhibit low activity, require harsh reaction conditions, and are unstable in air. To overcome these limitations, herein we propose the alloying of non-noble metal nanoparticles with phosphorus as a promising strategy for developing smart catalysts that exhibit both excellent activity and air stability. We synthesized a novel nickel phosphide nanoalloy (nano-Ni₂P) with coordinatively unsaturated Ni active sites. Unlike conventional air-unstable non-noble metal catalysts, nano-Ni₂P retained its metallic nature in air, and exhibited a high activity for the hydrogenation of various substrates with polar functional groups, such as aldehydes, ketones, nitriles, and nitroarenes to the desired products in excellent yields in water. Furthermore, the used nano-Ni₂P catalyst was easy to handle in air and could be reused without pretreatment, providing a simple and clean catalyst system for general hydrogenation reactions.     

Superconducting state parameters of indium-based binary alloys

Our well-recognized pseudopotential is used to investigate the superconducting state parameters viz: electron-phonon coupling strength λ. Coulomb pseudopotential μ*, transition temperature T _c, isotope effective exponent α and interaction strength N ₀ V for the In_1−x Zn _x and In_1−x Sn _x binary alloys. We have incorporated six different types of local field correction functions, proposed by Hartree, Taylor, Vashistha-Singwi, Ichimaru-Utsumi, Farid et al and Sarkar et al to show the effect of exchange and correlation on the aforesaid properties. Very strong influence of the various exchange and correlation functions is concluded from the present study. The comparison with other such theoretical values is encouraging, which confirms the applicability of our model potential in explaining the superconducting state parameters of binary mixture.     

Electrochemical Behavior and Its Electrocatalytic Activity of A P—Mo Heteropolyanion Modified ITO Electrode

ITO is a versatile material in the electronic industry because of its special transparent and conductive properties. However, there are a few reports regarding the adsorption of organic or organometallic compounds on the ITO surface1-4. The heteropolyanions are interested in the field of material science, catalytics, biology, and medicine owing to their chemical, structural, and electronic versatility5-7. One of the most important properties of polyoxometalate anions is their ability to a…