PVP-SDS软模板引导常温水相一锅法合成银纳米棒  

Aqueous Synthesis of Silver Nanorods at Normal Temperature in One-pot Directed by Soft Templates of PVP-SDS

作　　者：方云[1,2] 吴梦洁 任月萍 江明[1] 

机构地区：[1]聚合物分子工程教育部重点实验室复旦大学高分子科学系,上海200433 [2]江南大学化学与材料工程学院,无锡214122

出　　处：《化学学报》2011年第15期1737-1742,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(No.20871059)资助项目

摘　　要：以银氨络离子为前躯体,葡萄糖为还原剂,在聚乙烯吡咯烷酮(PVP)和十二烷基硫酸钠(SDS)组成的软模板中反应,首先得到形貌均一、粒径为(50±5)nm的纳米银颗粒,随后自发生长成银纳米棒.测试结果表明纳米银颗粒的等离子共振吸收峰在441 nm处,XRD表明其为面心立方体,在(111)晶面有最强吸收;高分辨透射电镜(HRTEM)观察到的晶格条纹和孪晶面证实其为多重孪晶(MTP),选区电子衍射(SAED)进一步证实了其具有五重孪晶结构.由于孪晶结构具有很高的生长活性,故推断上述孪晶纳米银颗粒经PVP-SDS软模板诱导,在常温、水相且无需多元醇辅助的条件下,仅通过受约束Ostwald熟化生长,便可一锅法合成出各向异性的银纳米棒.用该法替代高温有机相并加入晶种的多元醇方法,提高了湿化学方法的实用性并可以显著降低制备一维银纳米材料的成本.Uniform multiply twinned particles（MTP） of nanosilver were synthesized in polyvinylpyrroli-done（PVP） and sodium dodecyl sulfate（SDS） aggregations soft template solution by using ammoniacal sil-ver ions as reaction precursor and glucose as reducing agent.Subsequently,the MTP which were（50±5） nm in diameter spontaneously grew into silver nanorods.The surface plasma resonance peak of these silver MTP appeared at 441 nm and their XRD diffraction pattern revealed that they were face-centric structure（fcc） with the strongest diffraction peak at the（111） lattice plane.The lattice fringes and twin planes of the MTP were observed by the high-resolution transmission electron microscopy（HRTEM） and the quintuple twinned structure of the MTP was further validated by the selected area electron diffraction（SAED）.It is deduced that the as-prepared MTP of nanosilver with high growth activities could further grow induced by the PVP-SDS template.Eventually,anisotropy silver nanorods were simply prepared in one-pot by virtue of the restricted Ostwald ripening assisted by PVP-SDS soft template at normal temperature.This is a novel route instead of the conventional polyol-assisted and crystal seed-induced hyperthernal methods,which could evidently increase the applicability of the wet-chemical methods and markedly reduce the cost to pre-pare one-dimensional nanosilver materials.

关 键 词：多重孪晶 银纳米棒 一锅法 聚乙烯吡咯烷酮(PVP) 十二烷基硫酸钠(SDS) 

分 类 号：TB383.1[一般工业技术—材料科学与工程]