摘要
The transformation mechanisms of thiourea in ethylene glycol solution was systematically investigated in this report, which shows the transformation process is influenced by the anion （NO3-, CI-, Br-） and polyvinylpyrroli- done （PVP）. Thiourea （tu） isomerizes into ammonium thiocyanate when NO3- is present, regardless of the existence of PVP. For CI-, thiourea coordinates with copper anion to form [Cu（tu）]Clol/2H20 complex whether PVP is pre- sent. When it comes to Br-, thiourea hydrolyzes in the cooperation of PVP or coordinates with copper anion to form [Cu（tu）Br]. 1/2H20 complex without PVP. The different transformation routes will lead to different phase evolution of the Cu--S system. This work may provide a new understanding of the transformation of thiourea in ethylene glycol solution. The optical properties of the as-prepared copper sulfides exhibit significant stoichiometry- dependent features which may have potential applications in semiconductor photovoltaic devices.
The transformation mechanisms of thiourea in ethylene glycol solution was systematically investigated in this report, which shows the transformation process is influenced by the anion （NO3-, CI-, Br-） and polyvinylpyrroli- done （PVP）. Thiourea （tu） isomerizes into ammonium thiocyanate when NO3- is present, regardless of the existence of PVP. For CI-, thiourea coordinates with copper anion to form [Cu（tu）]Clol/2H20 complex whether PVP is pre- sent. When it comes to Br-, thiourea hydrolyzes in the cooperation of PVP or coordinates with copper anion to form [Cu（tu）Br]. 1/2H20 complex without PVP. The different transformation routes will lead to different phase evolution of the Cu--S system. This work may provide a new understanding of the transformation of thiourea in ethylene glycol solution. The optical properties of the as-prepared copper sulfides exhibit significant stoichiometry- dependent features which may have potential applications in semiconductor photovoltaic devices.
