砷烷的纯化技术研究进展

砷烷是发光二极管、超大规模集成电路、Ga As、Ga As P生长,N型硅外延、扩散、离子注入掺杂等不可缺少的重要原料,因此需要有极高的纯度。主要概述了砷烷常用的纯化方法,包括吸附法、低温冷冻/精馏法、膜分离法等。     

砷烷的气相色谱分析

砷烷是半导体生产和科学研究中的重要原材科,不但可应用于半导体外延膜N型掺杂和扩散工艺,还可以应用于离子注入工艺。同时,它对于砷化镓薄膜的制备,也是很重要的材料。砷烷是一种剧毒的易燃无色气体,具有令人厌恶的类似大蒜的气味,是溶血性毒物。由于它有剧毒,且易燃,虽然在实际工     

砷烷／磷烷监测报警仪的研制

基于火焰光度法原理工作的砷烷/磷烷监测报警仪可对半导体及电子工业生产中使用的砷烷/磷烷进行TLV级的监测报警,对砷烷的最小检测浓度为0.004×10~(-6),对磷烷的最小检测浓度为0.003×10~(-6),响应时间不大于30s。该仪器不仅检测灵敏度高,响应速度快,抗干扰能力强,而且性能稳定,可连续自动监测,操作简便,能满足现场监测要求。     

我国超纯砷烷产业化生产技术研究

砷烷是电子气体中用途十分广泛,技术难度非常大的烷类气体,它是一个国家电子气先进与否的重要标志。超纯砷烷的产业化技术,涉及到砷烷的合成、净化、分析检测等诸多专业,为发展我国IC产业,尽快开展超纯砷烷产业化技术研究意义重大。     

高纯砷烷的合成与开发进展

砷化氢(AsH3)是一种重要的电子特气,它主要用于N型半导体的掺杂、离子注入、化学气相沉积(CVD)等。AsH3的工业合成主要有化学合成法和电解合成法2种,后者可在恒定浓度条件下制备AsH3。为满足电子工业所需的高纯度需求,需要对其进行精制。AsH3的精制方法主要包括吸附法、低温冷冻/精馏法、膜分离法等,它们均能满足各自不同的需求。同时介绍了AsH3的国内外经济概况和产品标准。     

磷烷的纯化方法

该磷烷纯化方法的特点是，在无氧状态下，将含有杂质砷氢化物的粗制磷烷与活性炭接触，使处理的磷烷量小于活性炭重量，从而吸附除去了砷氢化物。吸附剂活性炭在使用结束后，进行加热抽空再生，可反复使用。     

特种气体贮运,应用,安全与特性——硅烷,砷烷,二氯二氢硅

特种气体贮运、应用、安全与特性——硅烷、砷烷、二氯二氢硅梁国仑（化工部光明化工研究设计院大连１１６０３１）硅烷别名甲硅烷；四氢化硅英文名称Ｓｉｌａｎｅ；Ｍｏｎｏｓｉｌａｎｅ；Ｓｉｌｉｃｏｎｔｅｔｒａｈｙｄｒｉｄｅ分子式ＳｉＨ４１物化性质硅烷是一种无色...     

含碳硼烷耐高温有机硅树脂的合成与表征

以1,2-二(4-羟基苯基)-碳硼烷和甲基乙烯基二氯硅烷为单体,在三乙胺为缚酸剂的条件下进行缩聚反应,得到聚乙烯基甲基硅氧烷-碳硼烷V-PMSCB.采用红外、核磁和GPC对V-PMSCB结构和相对分子质量进行表征,结果表明聚合物结构与设计结构完全一致,且其数均分子量为5.8×104.利用红外、差示扫描量热分析和热重分析...     

离子液体的合成与纯化方法研究进展

综述了离子液体的种类、合成及纯化方法。离子液体的纯度对其物理化学性质至关重要,是研究其应用的首要问题。本文介绍了离子液体的合成方法,并对比了其优缺点,发现合成方法对离子液体的纯度起着关键作用,指出了影响离子液体纯度的因素,分析对比了离子液体的纯化方法,包括真空干燥、有机溶剂萃取、重结晶、吸附剂法、分子筛法等,根据影响因素种类的不同,优选纯化方法,并对离子液体的发展进行了展望。     

相变材料微胶囊的制备及提纯

采用原位聚合法合成了以正十八烷为囊芯、三聚氰胺-甲醛树脂为囊壁的相变材料微胶囊,并通过密度法对微胶囊样品进行了提纯。通过扫描电子显微镜、差示扫描量热仪对纯化前后胶囊分析发现,微胶囊形貌明显变好,热效率也显著提高。     

TiB_2粉料的还原合成与酸洗纯化研究

用SHS还原合成法合成了TiB2 混合粉料 ,并通过酸洗处理获得了高纯TiB2 粉料。研究了合成过程和酸洗条件对TiB2 纯度的影响 ,对合成粉料酸洗过程进行了热力学分析。试验结果表明 ,TiO2 B2 O3 Mg三元系统的化学反应由两部分组成 ,第一部分由金属Mg还原出B和Ti单体 ,第二部分由这两种单体化合反应生成TiB2 。TiB2 粉料的纯度主要取决于酸洗条件。提高盐酸浓度、增加酸过量和延长酸洗时间可以提高TiB2 粉料的纯度 ,而升高酸洗温度还可以大大加快酸洗速度。     

特种气体六氟化钨的合成与净化

介绍了特种气体六氟化钨的性质、用途,并着重阐述了六氟化钨的合成方法及六氟化钨的净化工艺,指出了六氟化钨的发展前景及我国研究开发六氟化钨的紧迫性.     

Synthesis,Purification, and Physical Properties of Seven Twelve-Carbon Hydrocarbons

As part of a program to determine accurately the heats of combustion of specialized fuels in the kerosene range, seven hydrocarbons, biphenyl, bicyclohexyl, cyclohexylbenzene, n-hexylbenzene, n-hexylcyclohexane, 1-cyclopentylheptane, and n-dodecane were synthesized or purified from commercial material. Physical constants were determined on the purified samples. These materials may have use as secondary standards for heat of combustion measurements.     

The Importance of the Purification Step and the Characterization of the Products in the Synthesis of Carbon Nanodots

In the synthesis of carbon nanodots (CNDs), the critical step of the purification from the starting materials and unwanted side products is faced. In the exciting race toward new and interesting CNDs, this problem is often underestimated, leading to false properties and erroneous reports. In fact, on many occasions, the properties described for novel CNDs derive from impurities not completely eliminated during the purification process. Dialysis, for instance, is not always helpful, especially if the side products are not soluble in water. In this Perspective, the importance of the purification and characterization steps, in order to obtain solid reports and reliable procedures, is emphasized.     

Advancements in Copper Nanowires: Synthesis,Purification, Assemblies,Surface Modification,and Applications

Copper nanowires (CuNWs) are attracting a myriad of attention due to their preponderant electric conductivity, optoelectronic and mechanical properties, high electrocatalytic efficiency, and large abundance. Recently, great endeavors are undertaken to develop controllable and facile approaches to synthesize CuNWs with high dispersibility, oxidation resistance, and zero defects for future large‐scale nano‐enabled materials. Herein, this work provides a comprehensive review of current remarkable advancements in CuNWs. The Review starts with a thorough overview of recently developed synthetic strategies and growth mechanisms to achieve single‐crystalline CuNWs and fivefold twinned CuNWs by the reduction of Cu(I) and Cu(II) ions, respectively. Following is a discussion of CuNW purification and multidimensional assemblies comprising films, aerogels, and arrays. Next, several effective approaches to protect CuNWs from oxidation are highlighted. The emerging applications of CuNWs in diverse fields are then focused on, with particular emphasis on optoelectronics, energy storage/conversion, catalysis, wearable electronics, and thermal management, followed by a brief comment on the current challenges and future research directions. The central theme of the Review is to provide an intimate correlation among the synthesis, structure, properties, and applications of CuNWs.     

Purification and characterization of phthalocyanines

The technical details of a simple train sublimation (carrier gas) system for purification of organic materials are given and the refining procedure is described. A study of the effects of purification on metal free phthalocyanine (H₂Pc), magnesium phthalocyanine (MgPc), copper phthalocyanine (CuPc), vanadyl phthalocyanine (VOPc), zinc phthalocyanine (ZnPc) and lead phthalocyanine (PbPc) was carried out by means of optical absorption, X-ray diffraction, electron paramagnetic resonance, sublimation behaviour and photovoltaic data. It was found that train sublimation improves the quality of the pigments considerably. Spectroscopic results indicate the presence of a second phase in the purified MgPc.