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• 2018-12-10 02:28發(fā)布了問答

  零維，一維，二維和塊體納米材料有什么區(qū)別

  　

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• 2018-12-07 09:21發(fā)布了問答

  〝納米〞是什么意思？

  　

  340人看過

• 2018-12-03 12:06發(fā)布了問答

  搪瓷是什么概念？如何區(qū)別與陶瓷？？

  搪瓷是什么概念？如何區(qū)別與陶瓷？？

  290人看過

• 2018-11-26 19:46發(fā)布了問答

  哪些非金屬礦物材料能應(yīng)用于納米纖維

  　

  308人看過

• 2017-10-07 16:50發(fā)布了問答

  舉一些利用超導(dǎo)材料的例子

  　

  840人看過

• 2017-03-31 22:46發(fā)布了問答

  大神們，能幫我解釋一下什么是固態(tài)光觸媒嗎

  　

  481人看過

• 2014-09-11 07:07發(fā)布了問答

  碳納米材料觸摸屏屬于新型電子元器件嗎

  　

  356人看過

• 2013-10-01 06:53發(fā)布了問答

  女生考西安交大的材料學(xué)選哪個(gè)方向的研究生比較好啊

  本科是學(xué)礦物加工工程的，靠邊Z好，想問問適合女生的，就業(yè)前景比較好的方向，謝謝?。。?

  403人看過

• 2011-01-06 21:43發(fā)布了問答

  納米技術(shù)的特點(diǎn)？？

  　

  406人看過

• 2010-10-28 17:54發(fā)布了問答

  亞微米級(jí)是什么

  亞微米級(jí)是什么

  532人看過

• 2006-10-18 03:54發(fā)布了問答

  納米材料翻譯（3）

  The preparation of ultrafine powder of bismuth sulfide The synthesis of binary metal sulfides has been the focus of attention because of their important physical and chemical properties [1， 2]， good commercial applications in semiconductor... The preparation of ultrafine powder of bismuth sulfide The synthesis of binary metal sulfides has been the focus of attention because of their important physical and chemical properties [1， 2]， good commercial applications in semiconductors， pigments， luminescence devices， solar cells， IR detectors and optical fiber， communications， modern thermoelectric coolers [3]. Bismuth sulfide (Bi2S3) is a direct band gap material with Eg of 1.3? eV [4] and useful for photodiode arrays of photovoltaics [5]. Usually， busmuth sulfide can be prepared by direct reaction of bismuth and sulfur vapor in a quartz vessel at high temperature [6]. The chemical deposition method was applied to prepare bismuth sulfide through reaction of bismuth salt complexed by triethanolamine or EDTA with an aqueous solution containing a sulfur sourse such as thioacetamide， thiourea， sodium thiosulphate， geseous H2S. However， the powders obtained through this route are mostly amorphous or poorly crystallized [7–10]. The thermal decomposition preparation of bismuth sulfide was also reported by thermal decomposition of bismuth dithiocarbamate complexes [11]， metal ethylxanthate [12]， Bi-thiourea complex [13]. However， all these methods required high temperature or else the final poducts contain some impurites. Some researches use nonagueous solutions for depostion of bismuth sulfide thin films， but they have got amorphous products [14， 15]. Yu and Qian reported thermal synthesis of Bi2S3 through a reaction of BiCl3 and thiourea in ethanol at 140? °C [16]. 展開

  355人看過