CAJ | 학술논문

以不同平均分子质量的聚乙烯吡咯烷酮(PVP,通常用K值来表示PVP溶液相对粘度的特征值,粘度越大, PVP平均分子质量越大,平均分子质量为8000、40000、160000、360000的PVP分别标记为K17、K30、K60、K90)为表面活性剂,通过水热法合成了形貌和光学共振峰可控的银纳米结构。将反应体系加入到60 mL的不锈钢高压反应釜中,在一定的温度下加热数小时。我们在K17的水溶液中合成了尺寸均一的五重孪晶银纳米十面体。而在K30、K60和K90的乙二醇(EG)溶液中得到了纵横比随着PVP分子质量增大而增大的银纳米线。产物的形貌和微结构通过透射电镜(TEM)和场发射扫描电镜(FE-SEM)进行表征,表面等离子共振(SPR)吸收峰通过紫外-可见分光光度计进行测试,结果显示银纳米结构的表面等离子共振随着其形貌和尺寸的改变而发生变化。
이불동평균분자질량적취을희필각완동(PVP,통상용K치래표시PVP용액상대점도적특정치,점도월대, PVP평균분자질량월대,평균분자질량위8000、40000、160000、360000적PVP분별표기위K17、K30、K60、K90)위표면활성제,통과수열법합성료형모화광학공진봉가공적은납미결구。장반응체계가입도60 mL적불수강고압반응부중,재일정적온도하가열수소시。아문재K17적수용액중합성료척촌균일적오중련정은납미십면체。이재K30、K60화K90적을이순(EG)용액중득도료종횡비수착PVP분자질량증대이증대적은납미선。산물적형모화미결구통과투사전경(TEM)화장발사소묘전경(FE-SEM)진행표정,표면등리자공진(SPR)흡수봉통과자외-가견분광광도계진행측시,결과현시은납미결구적표면등리자공진수착기형모화척촌적개변이발생변화。
Ag nanostructures with wel-defined shapes and optical resonances have been mass-synthesized by a hydrothermal method. Polyvinylpyrrolidone (PVP) polymers with average molecular weights (MW) of 8000, 40000, 160000, and 360000 denoted as K17, K30, K60, and K90, respectively, were chosen as surfactants (K is usual y used to represent the characteristic value of relative viscosity of the PVP solution). It was found that the larger MW of PVP, the higher relative viscosity of the PVP solution. Al of the reactants were transferred into a 60 mL stainless steel autoclave and heated at a certain temperature for hours. Five-fold twinned Ag nanodecahedrons with nearly uniform size were synthesized in the aqueous solution of K17. Ag nanowires were obtained with the presence of K30, K60, and K90 in ethylene glycol (EG) solution, and the aspect ratios of the Ag nanowires increased with increasing the MW of PVP. The morphology and microstructures of the obtained products were characterized by transmission electron microscopy (TEM) and field emission-scanning electron microscopy (FE-SEM). The surface plasmon resonance (SPR) spectra of the Ag nanostructures were measured using an UV-Vis spectrophotometer. The results showed that the surface plasma resonance of the Ag nanostructures was dependent on their shape and size.