{"title":"Langmuir-Blodgett薄膜技术形成的II-VI半导体纳米颗粒:光学研究","authors":"A. Nabok, lwantono, A. Ray, A. Hassan, A. Ruban","doi":"10.1109/NANO.2002.1032242","DOIUrl":null,"url":null,"abstract":"CdS nanoparticles formed within Langmuir-Blodgett (LB) films of stearic acid and calix[8]arene were studied with different optical methods including surface plasmon resonance (SPR), ellipsometry, UV-visible absorption and fluorescence spectroscopy. For the first time, the process of formation of CdS nano-particles within LB films was monitored in-situ with SPR. The results of ellipsometry, SPR and UV-vis absorption spectroscopy were analysed to evaluate simultaneously the thickness, refractive index and extinction coefficient of LB films. It was shown that all three parameters increase as a result of formation of CdS nano-particles. Photoluminecsence measurements confirmed directly the blue spectral shift caused by CdS particles formation, a fact previously observed with UV-vis absorption spectroscopy. A large Stock's shift of the luminescence band can be related to the formation of \"dark excitons\" in the pallet-type CdS nano-clusters.","PeriodicalId":408575,"journal":{"name":"Proceedings of the 2nd IEEE Conference on Nanotechnology","volume":"12 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":"{\"title\":\"II-VI semiconductor nanoparticles formed by Langmuir-Blodgett film technique: optical study\",\"authors\":\"A. Nabok, lwantono, A. Ray, A. Hassan, A. Ruban\",\"doi\":\"10.1109/NANO.2002.1032242\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"CdS nanoparticles formed within Langmuir-Blodgett (LB) films of stearic acid and calix[8]arene were studied with different optical methods including surface plasmon resonance (SPR), ellipsometry, UV-visible absorption and fluorescence spectroscopy. For the first time, the process of formation of CdS nano-particles within LB films was monitored in-situ with SPR. The results of ellipsometry, SPR and UV-vis absorption spectroscopy were analysed to evaluate simultaneously the thickness, refractive index and extinction coefficient of LB films. It was shown that all three parameters increase as a result of formation of CdS nano-particles. Photoluminecsence measurements confirmed directly the blue spectral shift caused by CdS particles formation, a fact previously observed with UV-vis absorption spectroscopy. A large Stock's shift of the luminescence band can be related to the formation of \\\"dark excitons\\\" in the pallet-type CdS nano-clusters.\",\"PeriodicalId\":408575,\"journal\":{\"name\":\"Proceedings of the 2nd IEEE Conference on Nanotechnology\",\"volume\":\"12 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2002-11-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"2\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Proceedings of the 2nd IEEE Conference on Nanotechnology\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/NANO.2002.1032242\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the 2nd IEEE Conference on Nanotechnology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/NANO.2002.1032242","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
II-VI semiconductor nanoparticles formed by Langmuir-Blodgett film technique: optical study
CdS nanoparticles formed within Langmuir-Blodgett (LB) films of stearic acid and calix[8]arene were studied with different optical methods including surface plasmon resonance (SPR), ellipsometry, UV-visible absorption and fluorescence spectroscopy. For the first time, the process of formation of CdS nano-particles within LB films was monitored in-situ with SPR. The results of ellipsometry, SPR and UV-vis absorption spectroscopy were analysed to evaluate simultaneously the thickness, refractive index and extinction coefficient of LB films. It was shown that all three parameters increase as a result of formation of CdS nano-particles. Photoluminecsence measurements confirmed directly the blue spectral shift caused by CdS particles formation, a fact previously observed with UV-vis absorption spectroscopy. A large Stock's shift of the luminescence band can be related to the formation of "dark excitons" in the pallet-type CdS nano-clusters.
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