title: [Synthesis of Ag2S nanoparticles at room temperature and their characterization with XPS].
abstract: Nanocrystalline silver sulfide was successfully synthesized at room temperature and ambient pressure via a novel, safe, convenient and inexpensive redox reaction, using silver oxide, sulfur and polyformaldehyde as reactants and ethylenediamine as solvent. The products were characterized with XPS, XRD and TEM. XRD spectrum demonstrates a monoclinic Ag2S; TEM shows the products are rod-like nanoparticles with average diameter of 100 nm, its corresponding SAED reveals clear diffraction spots indexed as (120) and (303); XPS confirms the formation of Ag2S and indicates the sample's surface stoichiometry of Ag:S=1:0.453. The control experiments show polyformaldehyde and ethylenediamine are both important in the formation of products. Ethylenediamine accelerates the reactions via dissolving silver oxide and sulfur and neutralizing the by-product formic acid.
authors.affiliation: College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, China.
authors.forename: Yin
authors.initials: Y
authors.lastname: Ye
authors.forename: Ming-wang
authors.initials: MW
authors.lastname: Shao
authors.forename: Zheng-cui
authors.initials: ZC
authors.lastname: Wu
authors.forename: You-bao
authors.initials: YB
authors.lastname: Ni
mesh_terms: D005029:Ethylenediamines / Q000737:chemistry; D005557:Formaldehyde / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010087:Oxides / Q000737:chemistry; D056951:Photoelectron Spectroscopy / Q000379:methods*; D011108:Polymers / Q000737:chemistry; D018030:Silver Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013440:Sulfides / Q000138:chemical synthesis / Q000737:chemistry*; D013455:Sulfur / Q000737:chemistry; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D005029:Ethylenediamines; D010087:Oxides; D011108:Polymers; D018030:Silver Compounds; D012997:Solvents; D013440:Sulfides; D005557:Formaldehyde; C031234:ethylenediamine; D013455:Sulfur; C040225:disilver oxide; C013251:silver sulfide