光谱学与光谱分析
光譜學與光譜分析
광보학여광보분석
SPECTROSCOPY AND SPECTRAL ANALYSIS
2014年
12期
3292-3296
,共5页
纳米银%甲基橙%荧光增强%表面修饰剂
納米銀%甲基橙%熒光增彊%錶麵脩飾劑
납미은%갑기등%형광증강%표면수식제
Silver nanoparticle%Methyl orange%Metal-enhanced fluorescence%Surface modifier
分别以柠檬酸钠（CTS）和聚乙烯吡咯烷酮（PVP）为表面修饰剂，采用化学法制备纳米银（分别标记为Ag-CTS和Ag-PVP）。当甲基橙溶液中加入Ag-CTS或Ag-PVP时，S2→ S0和 S1→ S0荧光强度分别明显减弱和增强。不同的是A g-P V P引起 S2→ S0和 S1→ S0荧光强度减弱和增强的幅度更大，且 S2→ S0荧光峰出现红移。当甲基橙溶液中加入Ag-CTS时，S1→ S0荧光强度随时间延长逐渐增强，而加入Ag-PVP时，S1→ S0荧光强度则不随时间而变化。颗粒尺寸较大的片状结构纳米银引起 S1→ S0荧光强度增强比率较小。甲基橙溶液浓度越低， S1→ S0荧光强度增强比率越大。研究结果表明，纳米银表面吸附的不同表面修饰剂通过影响纳米银与甲基橙分子间距离进而影响纳米银的荧光增强效应；纳米银尺寸大小则由于所产生的局域面表面等离子共振特点等差异影响其局域场增强效应。
分彆以檸檬痠鈉（CTS）和聚乙烯吡咯烷酮（PVP）為錶麵脩飾劑，採用化學法製備納米銀（分彆標記為Ag-CTS和Ag-PVP）。噹甲基橙溶液中加入Ag-CTS或Ag-PVP時，S2→ S0和 S1→ S0熒光彊度分彆明顯減弱和增彊。不同的是A g-P V P引起 S2→ S0和 S1→ S0熒光彊度減弱和增彊的幅度更大，且 S2→ S0熒光峰齣現紅移。噹甲基橙溶液中加入Ag-CTS時，S1→ S0熒光彊度隨時間延長逐漸增彊，而加入Ag-PVP時，S1→ S0熒光彊度則不隨時間而變化。顆粒呎吋較大的片狀結構納米銀引起 S1→ S0熒光彊度增彊比率較小。甲基橙溶液濃度越低， S1→ S0熒光彊度增彊比率越大。研究結果錶明，納米銀錶麵吸附的不同錶麵脩飾劑通過影響納米銀與甲基橙分子間距離進而影響納米銀的熒光增彊效應；納米銀呎吋大小則由于所產生的跼域麵錶麵等離子共振特點等差異影響其跼域場增彊效應。
분별이저몽산납（CTS）화취을희필각완동（PVP）위표면수식제，채용화학법제비납미은（분별표기위Ag-CTS화Ag-PVP）。당갑기등용액중가입Ag-CTS혹Ag-PVP시，S2→ S0화 S1→ S0형광강도분별명현감약화증강。불동적시A g-P V P인기 S2→ S0화 S1→ S0형광강도감약화증강적폭도경대，차 S2→ S0형광봉출현홍이。당갑기등용액중가입Ag-CTS시，S1→ S0형광강도수시간연장축점증강，이가입Ag-PVP시，S1→ S0형광강도칙불수시간이변화。과립척촌교대적편상결구납미은인기 S1→ S0형광강도증강비솔교소。갑기등용액농도월저， S1→ S0형광강도증강비솔월대。연구결과표명，납미은표면흡부적불동표면수식제통과영향납미은여갑기등분자간거리진이영향납미은적형광증강효응；납미은척촌대소칙유우소산생적국역면표면등리자공진특점등차이영향기국역장증강효응。
Silver nanoparticles were prepared by chemical method using citricacid trisodiumsalt (Ag-CTS) and polyvinylpyrroli-done (Ag-PVP) as surface modifiers ,respectively .When Ag-CTS or Ag-PVP nanoparticles were added into methyl orange (MO) solution ,the enhanced-fluorescence of S1 → S0 and quenched-fluorescence of S2 → S0 were simultaneously observed .How-ever ,for the solution containing Ag-PVP ,the red-shift of fluorescence peak of S1 → S0 was observed and the extents of the en-hanced-fluorescence of S1 → S0 and quenched-fluorescence of S2 → S0 are higher than those of the solution containing Ag-CTS . With the increase in reaction time the fluorescence intensity of S1 → S0 increased gradually in the solution containing Ag-CTS nan-oparticles and no change was observed in the solution containing Ag-PVP nanoparticles .The lower the MO concentration ,the higher the fluorescence intensity ratio of S1 → S0 .The results indicated that the silver nanoparticles with different surface modifi-ers affect the metal-enhanced fluorescence by impacting the distance between the methyl orange and silver nanoparticles .The size of silver nanoparticles affects the metal-enhanced fluorescence due to the difference in the surface plasma resonance properties .
