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以双官能团配体巯基丙酸(MPA)为保护剂,通过配体置换法和液相化学还原法制备得到纳米银。考察了双官能团配体对纳米银的制备及热分解的影响。配体置换法制备的纳米银粒径为50 nm左右,化学还原法制备的纳米银粒径为10 nm左右。元素分析结果和X射线光电子能谱表明MPA通过S原子与Ag原子形成共价键,同时通过烷基链之间的氢键作用及范德华力形成多层保护剂保护的纳米银。将纳米银在200℃下烧结并对烧结产物进行表征,结果表明加热使得C—S键断裂,Ag/MPA热分解形成硫化银。
Using the bifunctional ligand, mercaptopropionic acid (MPA) as the protective agent, nanosilver was prepared by ligand exchange method and liquid phase chemical reduction method. The effects of bifunctional ligands on the preparation and thermal decomposition of nanosilver were investigated. The size of the nanosilver prepared by the ligand exchange method is about 50 nm, and the size of the nanosilver prepared by the chemical reduction method is about 10 nm. The results of elemental analysis and X-ray photoelectron spectroscopy show that MPA forms a covalent bond with the Ag atom via the S atom and simultaneously forms a nano-silver protected by a multi-layer protective agent through hydrogen bonding and van der Waals forces between the alkyl chains. The nanosilver was sintered at 200 ℃ and the sintered product was characterized. The results showed that heating caused the C-S bond to rupture and the thermal decomposition of Ag / MPA to form silver sulfide.