一甲基硫脲与支持电解质的阴离子在银电极上共吸附的拉曼光谱研究

本文用电化学现场表面增强拉曼散射光谱（ＳＥＲＳ）技术研究了ＭＴＵ在ＨＣｌＯ４、Ｈ２ＳＯ４和ＨＮＯ３介质中分别与一种或两种无机阴离子的共吸附行为，发现ＣｌＯ－４、ＳＯ２－４和ＮＯ－３等弱吸附无机阴离子均能被ＭＴＵ诱导物理吸附在其质子化了的氨基（ＮＨ＋３）上，这三种无机阴离子被ＭＴＵ诱导物理吸附的强弱顺序是：在电极电位位于－０．２Ｖ～－０．７Ｖ区间时，ＳＯ２－４＞ＣｌＯ－４＞ＮＯ－３，在电位位于－０．８Ｖ～－１．２Ｖ区间时，ＣｌＯ－４＞ＳＯ２－４＞ＮＯ－３。     

SERS技术研究不同酸度下TU与ClO_4~-在金电极上的共吸附

ＳＥＲＳ技术研究不同酸度下ＴＵ与ＣｌＯ－４在金电极上的共吸附姚建林袁亚仙曹佩根顾仁敖（苏州大学化学系苏州２１５００６）田中群（厦门大学化学系固体表面物理化学国家重点实验室厦门３６１００５）ＳＥＲＳＳｔｕｄｉｅｓｏｎＣｏａｄｓｏｒｐｔｉｏｎｏｆＴ...     

二巯基嘧啶与ClO_4~－在银电极上的共吸附

二巯基嘧啶与ＣｌＯ_４~－在银电极上的共吸附王仲权，李五湖，任斌，田中群（厦门大学化学系厦门大学固体表面物理化学国家重点实验室厦门３６１００５）Ｃｏａｄｓｏｒｐｔｉｏｎｏｆ２－ＭｅｒｃａｐｔｏｐｙｄｍｉｄｉｎｅｗｉｔｈＣｌＯａｔＳｉｌｖｅｒＥｌｅｃｔｒ...     

硫脲与ClO_4~－在银电极上的共吸附

硫脲与ＣｌＯ_４~－在银电极上的共吸附乔专虹，吴芸，顾仁敖（苏州大学化学系苏州２１５００６）李五湖，王仲权，田中群（厦门大学化学系固体表面物理化学国家重点实验室厦门３６１００５）ＣｏａｄｓｏｒｐｔｉｏｎｏｆＴｈｉｏｕｒｅａｗｉｔｈＣｌＯａｔＳｉｌｖｅｒ...     

PdO引入对CuO／γ—Al2O3催化剂结构与性能的影响

运用ＰＴＲ,ＳＥＭ,ＸＲＤ阶梯扫描及ＣＯ和ＣＨ４氧化活性测定表征技术研究了ＣｕＯ／γ－Ａｌ２Ｏ３催化剂及负载ＰｄＯ对催化剂性能的影响。结果表明,ＣｕＯ／γ－Ａｌ２Ｏ３催化剂上引入不同含量的ＰｄＯ,使ＴＰＲ还原峰温欠下降。对载体上ＣｕＯ平均晶粒大小的测定表明随ＰｄＯ含量的增加,ＣｕＯ平均晶粒逐渐减小;ＳＥＭ对ＰｄＯ－ＣｕＯ／γ－Ａｌ２Ｏ３催化剂上Ｃｕ元素分布的面扫描测定亦证实了随ＰｄＯ含量的增加,催     

苯甲酸和对羟基苯甲酸对Cl^—在银表面上吸附竞争的SERS研究

对Ｃｌ＾－在银胶体系中与苯甲酸（Ｃ６Ｈ５ ＣＯＯＨ）和对羟基苯甲酸（ＨＯＣ６Ｈ４ＣＯＯＨ）在银表面上的相互作用和吸附竞争进行了研究，证实了Ｃｌ＾－对上述两类分子的ＳＥＲＳ信号增强具有明显的淬灭效应，１６４０ｃｍ＾－１振动所反映的Ｃｌ＾－存在前后－ＣＯＯ＾－与银表面相互作用强弱的变化，证实了Ｃｌ＾－促使分子从银表面脱附这一过程的存在，同时对－ＯＨ在其中的影响作了讨论。     

Cl^—对铜表面上表面增强剌曼散射效应的影响

以机械抛光粗糙的铜表吸附衬底，在固／液系统中对Ｃｌ＾－及其不同的存在方式对表面增强喇曼散射效应和衬底表面的影响进行了较为系统的分析研究，结果表明，只有当适量的Ｃｌ＾－以适当的方式存在时才对ＳＥＲＳ产生影响；ＳＥＲＳ衬氏的表面形貌也随Ｃｌ＾－作用方式的变化而变化。     

非晶态Fe0.5Al0.5PO4表面上激光促进甲烷直接氧化合成甲醇的研究

用溶胶－凝胶法合成了非晶态Ｆｅ０．５Ａｌ０．５ＰＯ４。用ＸＲＤ和ＴＰＲ表征了其结构和晶格氧的活性;用ＩＲ和ＴＰＤ表征了ＣＨ４在其表面上的吸附行为;用ＬＳＳＲ方法考察了ＣＨ４直接氧化合成ＣＨ３ＯＨ的反应规律。结果表明,Ｆｅ０．５Ａｌ０．５ＰＯ４具有非晶态的结构,ＦｅＰＯ４和ＡｌＰＯ４的微区被均匀地相互隔离,导致固体本身不具有长程有序性。非晶态的Ｆｅ０．５Ａｌ０．５ＰＯ４与晶态的Ｆｅ０．５Ａｌ０．５Ｐ     

碘化银胶体上四苯基卟啉金属配合物的表面增强拉曼光谱研究

研究了四苯基卟啉金属配合物（ＭＴＰＰ,Ｍ＝Ａｇ,Ｍｇ,Ｃｕ,Ｐｄ）在Ａｇｌ胶体上的表面增强拉我谱（ＳＥＲＳ）。结果显示ＭｇＴＰＰ与基底发生金属交换生成ＡｇＴＰＰ,而在ＰｄＴＰＰ和ＣｕＴＰＰ上则未发现金属交换,除卟啉环的振动外,一些苯环振动带也被显著增强,在１４００～１６００ｃｍ＾－１范围,ＰｄＴＰＰ和ＣｕＴＰＰ的ＳＥＲＳ与ＡｇＴＰＰ有很大差别,可能反映了吸附分子在次甲基桥碳原子Ｃｍ附近立体构型的差     

MAl2O4：Eu^2＋,RE^3＋,长余辉发光性质的研究

研究鳞石英结构碱土铝酸盐ＭＡｌ２Ｏ４：Ｅｕ＾２＋,ＲＥ＾＋（Ｍ＝Ｍｇ,Ｃａ,Ｓｒ,Ｂａ：ＲＥ＝Ｙ,Ｌａ,Ｃｅ,Ｐｒ,Ｎｄ,Ｓｍ,Ｇｄ,Ｔｂ,Ｄｙ,Ｈｏ,Ｅｒ,Ｔｂ,Ｄｙ,Ｈｏ,Ｅｒ,Ｔｍ,Ｙｍ,Ｙｂ,Ｌｕ）的荧光及长余辉发光性质。其发光由Ｅｕ＾２＋的４ｆ－５ｄ跃迁产生。ＲＥ＾３＋作为辅助激离子,提供合适的陷阱能级。即使用ＲＥ＾３＋的特性波长激发,在ＭＡｌ２Ｏ４：Ｅｕ＾３＋的发光中也观察不到ＲＥ＾３     

Cu电极上咪唑与苯并三唑共吸附的SERS研究

Ｃｕ电极上咪唑与苯并三唑共吸附的ＳＥＲＳ研究张传飞，旷富贵，徐知三，王小华（武汉大学环境科学系武汉４３００７２）（武汉大学分析测试中心武汉４３００７２）ＳｔｕｄｙｏｎＴｈｅＣｏａｄｓｏｒｐｔｉｏｎｏｆＩｍｉｄａｚｏｌｅａｎｄＢｅｎｚｏｔｒｉｚｏｌｅｏ...     

SERS谱峰强度对电位阶跃的响应速率

ＳＥＲＳ谱峰强度对电位阶跃的响应速率顾仁敖，吴芸，乔专虹，姚建林（苏州大学化学系苏州２１５００６）田中群，李五湖（厦门大学化学系厦门３６１００５）ＴｈｅＲｅｓｐｏｎｓｅＲａｔｅｏｆＴｈｅＳＥＲＳＩｎｔｅｎｓｉｔｙＷｈｅｎＡＰｏｔｅｎｔｉａｌＳｔｅｐｉ...     

N-甲基咪唑与2,2''-联吡啶在铜表面共吸附的SERS研究

采用电化学现场表面增强拉曼光谱(SERS)分别研究了非水体系中N-甲基咪唑(NMIM),2,2’-联吡啶(2,2-’bipy)在铜电极表面的吸附行为以及两者的共吸附行为。结果表明在非水体系中,NMIM可在很宽的电位区间内稳定地吸附在金属表面,而2,2-’bipy在一个相对较窄的电位区间内能稳定地吸附在金属表面。当两者共存时存在竞争吸附和共吸附行为,较负的电位下主要以NMIM吸附为主,在略偏负的电位区间内以2,2-’bipy吸附为主,而正电位区间两者在金属表面共吸附,NMIM倾斜吸附在金属表面,而2,2’-bipy以顺式结构垂直吸附在金属表面。     

表面增强拉曼光谱研究硫脲衍生物与ClO_4~-的共吸附行为

表面增强拉曼光谱研究硫脲衍生物与ＣｌＯ－４的共吸附行为顾仁敖１姚建林１袁亚仙１钟起玲２田中群３（１苏州大学化学系苏州２１５００６）（２江西师范化学系南昌３３００２７）（３厦门大学固体表面物理化学国家重点实验室，化学系厦门３６１００５）Ｓｕｒｆａｃｅ...     

Effects of electrolytes on the fabrication of three‐dimensional nanoporous gold films by a rapid anodic potential step method for SERS

A unique one‐step anodic potential step strategy has been developed recently by our group to fabricate a three‐dimensional (3D) nanoporous gold film (NPGF) within 1 min as an efficient surface‐enhanced Raman scattering (SERS) active substrate. Gloria et al. (J. Electroanal. Chem. 2011, 656, 114–119) demonstrated that the prepared NPGF under optimum conditions (2 M HCl, 50 s) has higher SERS intensities than that of a commercial single‐use gold substrate. However, the SERS performance of 3D NPGFs fabricated in neutral KCl by this strategy have not been investigated. In this paper, SERS performances of the NPGFs fabricated in electrolytes of KCl and HCl are compared for the first time, using pyridine as a test molecule. Equivalent SERS intensities can be obtained on the 3D NPGFs prepared in these two electrolytes under respectively optimum conditions. The results suggest that hot spots of nanogaps and crevices because of the aggregation/coalescence of gold nanoparticles and the formation/removal of thin gold oxide coatings contribute greatly to the high SERS activity. Copyright © 2012 John Wiley & Sons, Ltd.     

拉曼光谱研究粗糙铂电极表面吡啶和氢(或含氧物种)的共吸附

拉曼光谱研究粗糙铂电极表面吡啶和氢（或含氧物种）的共吸附蔡文斌任斌佘春兴田中群（固体表面物理化学国家重点实验室厦门大学化学系物理化学研究所厦门３６１００５）ＲａｍａｎＳｐｅｃｔｒｏｓｃｏｐｉｃＩｎｖｅｓｔｉｇａｔｉｏｎｏｆｔｈｅＣｏａｄｓｏｒｐｔｉ...     

Research on the Raman properties of NiFe/cicada wing composite SERS platform modified by silver nanoparticles

Composite structures have been widely concerned in the preparation of surface enhanced Raman scattering (SERS) substrates. In this paper, by solving the problem that the magnetic material was difficult to glow in magnetron sputtering, ferro-nickel (NiFe) alloy was deposited on the cicada wing (CW) and the NiFe/CW substrate was obtained. The results of sliver nanoparticles (Ag NPs) modified on the substrate were subsequently compared, and the SERS properties of the new Ag/NiFe/CW substrate were analyzed. Obviously, the intensity of SERS signals has been greatly improved after the modification of Ag NPs, and the substrate exhibits excellent reproducibility. The Ag NPs modified substrates were also applied to the detection of toxic crystal violet (CV) solution, which showed remarkable SERS activity. It has been proved that the strategy of modifying Ag NPs on the substrate to form a composite structure has great potential for improving the SERS performance of the substrate.     

Use of atomic layer deposition to improve the stability of silver substrates for in situ,high‐temperature SERS measurements

A method to stabilize silver surface‐enhanced Raman spectroscopy (SERS) substrates for in situ, high‐temperature applications is demonstrated. Silver island films grown by thermal evaporation were coated with a thin layer (from 2.5 to 5 nm) of alumina by atomic layer deposition (ALD), which protects and stabilizes the SERS‐active substrate without eliminating the Raman enhancement. The temporal stability of the alumina‐coated silver island films was examined by measurement of the Raman intensity of rhodamine 6G molecules deposited onto bare and alumina‐coated silver substrates over the course of 34 days. The coated substrates showed almost no change in SERS enhancement, while the uncoated substrates exhibited a significant decrease in Raman intensity. To demonstrate the feasibility of the alumina‐coated silver substrate as a probe of adsorbates and reactions at elevated temperatures, an in situ SERS measurement of calcium nitrate tetrahydrate on bare and alumina‐coated silver was performed at temperatures ranging from 25 to 400 °C. ALD deposition of an ultrathin alumina layer significantly improved the thermal stability of the SERS substrate, thus enabling in situ detection of the dehydration of the calcium nitrate tetrahydrate at an elevated temperature. Despite some loss of Raman signal, the coated substrate exhibited greater thermal stability compared to the uncoated substrate. These experiments show that ALD can be used to synthesize stable SERS substrates capable of measuring adsorbates and processes at high temperature. Copyright © 2009 John Wiley & Sons, Ltd.