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1、AppliedSurfaceScience253(2007)79777980www.elsevier.com/locate/apsuscPhoton-assistedsynthesisofC60polymersbylaserirradiationHiroshiYamamoto*,NobuyukiIwata,RyojiHashimoto,ShingoAndoCollegeofScienceandTechnology,NihonUniversity,7-24-1Narashinodai,Funabashi-shi,Chiba274-8
2、501,JapanAvailableonline2March2007AbstractTheharmonicsofafreeelectronlaser(FEL)wereirradiatedinvacuumtosurfacesofcompressedC60andamixtureofC60andI2.ThepowerandfrequencyofthefundamentalFELmacro-pulsewereca.0.5mJ/pulseand2Hz,respectively.Theirradiationtimewas120180min.A
3、fterirradiationofFELwithatypicalwavelengthof450or345nm,theRamanpeakofAg(2)-derivedvibrationmodeofC60shiftedtothelower-energyside.TheRamanpeakshiftofthemixturepowdersamplewasgreaterthanthatofpureC60.Furthermore,changesofthecrystallinestructureindicatedthatvariousinterm
4、olecularcombinationsoccurredbyirradiation.Theseresultsstronglysuggestthatthree-dimensionalpolymerizationofC60waspromotedbylaserirradiationandtheeffectofphoton-assistedhole-dopingfromiodineatomstoC60molecules.#2007ElsevierB.V.Allrightsreserved.Keywords:C60;Polymerizati
5、on;Freeelectronlaser(FEL);Hole-doping;Ramanspectroscopy1.IntroductionThepolymerizationsusuallyproceedbycompressionattheorderofgigapascalsorheatingtogreaterthanathousandSincethepolymerizationofC60filmswasfirstaccom-degrees[4].TheC60cagespartiallycollapseunderstringentpli
6、shedusingphototransformation[1],manystudieshavepressureconditions.ThesepolymerizationprocessesarenotexaminedC60polymersynthesizedusingvariousexcitationwell-controlledandareunsuitabletosupplysufficientlylargeprocesses[2]suchaselectron-beamirradiation[3],high-3DC60polyme
7、rsforapplications.pressure[4],plasma-inducedexcitation[5],andsoon.Thisworkisintendedtodevelopanovelphoton-assistedBecauseofthoseadequatechemicalorphysicalexcitations,aprocessforsynthesisofC60polymersbylaserirradiationundercarbondoublebondinahexagonofaC60cageisbroken;i
8、tmoderatelyhighpressure.Wehavealsodescribedaholedopingtransformsintoanintermolecularfour-foldringwithaeffect,asdemonstratedi
