[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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