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[交流] 有关二硫化锡合成问题请教

参考文献Energy Procedia 15 (2012) 340 – 346,采用化学浴法在导电玻璃上合成二硫化锡膜,具体过程如下:
10 ml of glacial acetic acid was poured into a 100 ml glass beaker and 1 g of stannous chloride (SnCl2 2H2O) added to the acid. The SnCl2 was dissolved by placing the beaker onto a hot plate and heating the solution to 60ºC. After 5 minutes of heating, a few drops of concentrated HCl were added drop by drop to the  solution  in  order  to  obtain  a  clear  solution.  24  ml  of  6  M triethanolamine  (TEA),  8  ml  of  0.5  M thioacetamide  and  a  pre-determined  quantity  of  aqueous  NH3  were  added  to  the  Sn-precursor  solution followed by sufficient quantity of double distilled water to make up 100 ml of the reaction bath. Cleaned  glass  substrates  were  immersed  vertically  into  the  reaction  mixture.  The  temperature  of  the  bath  was maintained at a constant value of 60oC and the solution stirred continuously using a magnetic stirrer. The colour of the reaction bath was initially a golden yellow; it turned to light brown and then to dark brown where the deposition started to occur on the substrates.  The deposition time was carried out for 2 hours and  the  volume  of  ammonia  in  the  reaction  bath  was  varied  from  12  ml  to  20  ml,  keeping  the  other parameters constant.  The deposited layers were cleaned using distilled water and dried in a hot air oven.
过程中合成的产物个人觉得应为一硫化锡,不该是二硫化锡,因为采用SnCl2 2H2O为原料,锡为二价,而且文献中锡硫摩尔比接近1:1,但文献得到的是二硫化锡,想请教一下二硫化锡生成反应方程式?
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