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2000 Fiscal Year Final Research Report Summary

Development of a direct analysis technique for organic compounds adsorbed on environmental small particles

Research Project

Project/Area Number 10558081
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section展開研究
Research Field Environmental dynamic analysis
Research InstitutionUniversity of Tokyo

Principal Investigator

OWARI Masanori  Environmental Science Center, University of Tokyo Professor, 環境安全研究センター, 教授 (70160950)

Co-Investigator(Kenkyū-buntansha) SAKAMOTO Tetsuo  Environmental Science Center, University of Tokyo Associate Professor, 環境安全研究センター, 助教授 (20313067)
Project Period (FY) 1998 – 2000
KeywordsUltra fine ion beam / Gallium focused ion beam / Secondary ion mass spectrometry / Nano-scale tree-dimensional analysis / Elemental analysis with high spatial resolution / Multi-elements detection / Analytical reliability / High accurate cross-sectioning of sample
Research Abstract

Large attention has been paid recently to endocrine disrupting chemicals. Because many of such substances are hydrophobic and of low vapor pressure, environmental small particles are believed to act as carrier of endocrine disrupters. Therefore, it is very important to establish techniques appropriate to analyze organic species adsorbed on small particles. Time-of-flight secondary ion mass spectrometry (TOF-SIMS) is well known as one of the most sensitive analytical techniques applicable for surface organic species. Gallium focused ion beam is now the most popular primary ion beam of TOF-SIMS.By using this finely focused primary ion beam lateral resolution of mapping analysis reaches to sub-micrometer region.
The authors examined the applicability of TOF-SIMS to the analysis of organic species adsorbed on individual small particles in order to evaluate the technique as an environmental analytical tool. Di (2-ethylhexyl) phthalate, dioctyl phthalate and 2, 2-bis (4-hydroxyphenyl) propane … More (bisphenol-A) were used as model compounds. All of them are suspected as endocrine disrupters.
First, about 1 monolayer of each compound was adsorbed on flat substrates instead of particles, and mass spectra were measured. Substrates were silver, silicon covered with native oxide, and graphite. Although spectral intensity was much higher on silver substrate, fragmentation pattern was similar for all substrates. Both of dialkyl phthalates yielded the most intense fragment peak at m/z=149, which is characteristic of phthalates. Alkyl-chain-originated fragment peaks were weak in the spectra and were difficult to assign because of hydrocarbon contamination. Therefore, distinction of phthalate isomers was difficult. Bisphenol-A showed characteristic fragment peak at m/z=213.
Next, di (2-ethylhexyl) phthalate or bisphenol-A was adsorbed on 6.8 micrometer silica particles by dipping the particles into dilute solutions. The particles were dried and spread on a glass plate. By pressing an indium plate onto the particles TOS-SIMS samples were prepared. Spectral mapping was performed over 50 micrometer square area by 256x256 pixel resolution. From the 2-dimensional spectral map data Si^+(m/z=28), In^+(m/z=115), phthalate fragment ion (m/z=149), and bisphenol-A fragment ion (m/z=213) maps were obtained. In^+ and Si^+ showed complementary maps with each other. Fragment ions showed the same distribution as Si^+.Another sample was the mixture of separately prepared particles, one adsorbed phthalate and the other bisphenol-A, on an indium plate. In a view field of the mixture sample two kinds of particles were distinguished from each other by comparing fragment ion maps. Less

  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] K.Takanashi,H.Wu,Y.Kuramoto.Zh.H.Cheng et al.: "An ion and electron multibeam system for three-dimensional microanalysis"Surf.Interface Anal.. 30. 493-496 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Wu,K.Takanashi,N.Ono,Zh.H.Cheng.T.Sakamoto et al.: "Three-dimensional microanalysis of the wire-pad contact region of integrated circuits"Surf.Interface Anal.. 19. 508-513 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sakamoto,K.Takanashi,Zh.H.Cheng.N.Ono,H.Wu et al.: "Novel apparatus for three-dimensional microanalysis using ion and electron dual focused beams"Ins.Phys.Conf.Ser.. 165. 347-348 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Owari,T.Sakamoto,M.Takanashi,Z.Cheng et al.: "Composition of cross sections created with a gallium focused ion beam"J.Surf.Anal.. 5. 356-359 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Z.Cheng,T.Sakamoto,M.Takahashi,Y.Kuramoto et al.: "Microarea analysis using Auger electrons induced by gallium focused ion beam"J.Surf.Anal.. 5. 181-184 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Z.Cheng, T.Sakamoto, M.Takahashi, Y.Kuramotok, M.Owari and Y.Nihei: "Microarea analysis using Auger electrons induced by gallium focused ion beam"J.Surf.Anal.. 5. 181-184 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Owari, T.Sakamoto, M.Takahashi, Z.Cheng, Y.Kuramoto and Y.Nihei: "Compositions of Cross Sections Created with a Gallium focused Ion Beam"J.Surf.Anal.. 5. 356-359 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Sakamoto, K.Takanashi, Zh.H.Cheng, N.Ono, H.Wu, M.Owari and Y.Nihei: "Novel apparatus for three-dimensional microanalysis using ion and electron dual focused beams"Inst.Phys.Conf.Ser.. No.165 : Symposium 9, IOP Publishing. 347-348 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Takanashi, H.Wu, N.Ono, Zh.H.Cheng, T.Sakamoto, M.Owari and Y.Nihei: "Three-dimensional microanalysis of the wire-padcontact region of integrated circuit"Inst.Phys.Conf.Ser.. No.165 : Symposium 9, IOP Publishing. 355-356 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Wu, K.Takanashi, N.Ono, Zh.H.Cheng, T.Sakamoto, M.Owari and Y.Nihei: "Three-dimensional microanalysis of the wire-padcontact region of integrated circuits"Surf.Interface Anal.. 29. 508-513 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Takanashi, H.Wu, Y.Kuramoto, Zh.H.Cheng, T.Sakamoto, M.Owari adn Y.Nihei: "An ion and electron multibeam system for three-dimensional microanalysis"Surf.Interface Anal.. 30 (1). 493-496 (2000)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2002-03-26  

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