NanospectroscopyPub Date : 2015-01-19DOI: 10.2478/nansp-2014-0003
Virginia Merk, A. Nerz, Sebastian Fredrich, U. Gernert, S. Selve, J. Kneipp
{"title":"Optical properties of silver nanocube surfaces obtained by silane immobilization","authors":"Virginia Merk, A. Nerz, Sebastian Fredrich, U. Gernert, S. Selve, J. Kneipp","doi":"10.2478/nansp-2014-0003","DOIUrl":"https://doi.org/10.2478/nansp-2014-0003","url":null,"abstract":"Abstract Silver nanocubes were synthesized by the polyol method and immobilized on a surface in a simple approach using an aminopropyltriethoxysilane (APTES). The optical and structural properties of the polyvinylpyrrolidone (PVP) stabilized nanocubes were investigated in solution and on glass surfaces. The SERS enhancement factors at two excitation wavelengths for crystal violet were compared with electric fields arising in different nano¬particle configurations using finite-difference time-domain simulations. They are in agreement with the preferred face-to-face orientation in the nanoaggregates on the surfaces. The facile immobilization enables on-demand preparation and use of the nanocubes in real analytical applications.","PeriodicalId":18890,"journal":{"name":"Nanospectroscopy","volume":"62 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2015-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75021659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
NanospectroscopyPub Date : 2015-01-09DOI: 10.2478/nansp-2014-0002
Jana Kalbacova, R. D. Rodriguez, Vivek Desale, Maximilian Schneider, Ihsan Amin, Rainer Jordan, D. Zahn
{"title":"Chemical stability of plasmon-active silver tips for tip-enhanced Raman spectroscopy","authors":"Jana Kalbacova, R. D. Rodriguez, Vivek Desale, Maximilian Schneider, Ihsan Amin, Rainer Jordan, D. Zahn","doi":"10.2478/nansp-2014-0002","DOIUrl":"https://doi.org/10.2478/nansp-2014-0002","url":null,"abstract":"Abstract Silver nanostructures are used in tip- and surface-enhanced Raman spectroscopy due to their high electric field enhancement over almost the entire visible spectral range. However, the low chemical stability of silver, compared to other noble metals, promotes silver sulfide and sulfate formation which decreases its plasmonic activity. This is why silver tips are usually prepared on the same day of the experiments or are disregarded in favour of gold that is chemically more stable. Since silver degradation cannot be avoided, we hypothesized that a protection layer may be able to minimize or control degradation. In this contribution, we report the successful preparation of 4-biphenylthiol and 4’-nitro-4-biphenylthiol self-assembled monolayers on silver tips in order to protect them against tarnishing and to investigate the effect on the life-time of the plasmonic activity. The electrochemically etched wire surface was probed via Raman spectroscopy and scanning electron microscopy. The best long term stability and resistance against corrosion was shown by a monolayer of 4-biphenylthiol formed from dimethylformamide which did not display any degradation of the metallic tip during the observed period. Here, we demonstrate an easy and straightforward approach towards increasing the chemical stability of silver TERS-active probes.","PeriodicalId":18890,"journal":{"name":"Nanospectroscopy","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2015-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84393349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
NanospectroscopyPub Date : 2014-11-22DOI: 10.2478/nansp-2014-0001
E. Ostertag, Anita Lorenz, K. Rebner, R. Kessler, A. Meixner
{"title":"Extension of solid immersion lens technology to super-resolution Raman microscopy","authors":"E. Ostertag, Anita Lorenz, K. Rebner, R. Kessler, A. Meixner","doi":"10.2478/nansp-2014-0001","DOIUrl":"https://doi.org/10.2478/nansp-2014-0001","url":null,"abstract":"Abstract Scanning Near-Field Optical Microscopy (SNOM) has developed during recent decades into a valuable tool to optically image the surface topology of materials with super-resolution. With aperture-based SNOM systems, the resolution scales with the size of the aperture, but also limits the sensitivity of the detection and thus the application for spectroscopic techniques like Raman SNOM. In this paper we report the extension of solid immersion lens (SIL) technology to Raman SNOM. The hemispherical SIL with a tip on the bottom acts as an apertureless dielectric nanoprobe for simultaneously acquiring topographic and spectroscopic information. The SIL is placed between the sample and the microscope objective of a confocal Raman microscope. The lateral resolution in the Raman mode is validated with a cross section of a semiconductor layer system and, at approximately 180 nm, is beyond the classical diffraction limit of Abbe.","PeriodicalId":18890,"journal":{"name":"Nanospectroscopy","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2014-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82814898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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