Study of the Conformational Structure and Cluster Formation in a Langmuir-Blodgett Film Using Second Harmonic Generation, Second Harmonic Microscopy, and FTIR Spectroscopy

M. S. Johal, A. N. Parikh, Y. Lee, J. L. Casson, L. Foster, B. I. Swanson, D. W. McBranch, D. Q. Li, J. M. Robinson

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Nonlinear second harmonic generation (SHG), second harmonic microscopy (SHM), and infrared spectroscopy are used to determine the structural and optical properties of the Langmuir-Blodgett (LB) monolayer assemblies of NLO-active, 4-eicosyloxo-(E)-stilbazolium iodide (4-EOSI) on a glass substrate. The packing characteristics of the pretransferred interfacial films are determined using Π-A isotherm measurements. The molecular coverage of the transferred films is determined by ellipsometry. The films formed on both sides of the glass substrate show substantial second harmonic (SH) conversion from p-polarized 1064 nm fundamental excitation. The SHG and FTIR measurements imply that the single LB layer on glass is composed of oriented clusters of 4-EOSI molecules that are laterally discontinuous. Ordered clusters up to 40 μm in diameter are directly observed using SHM. Subsequent LB transfers using the same 4-EOSI molecule or an amphiphile of comparable chain-length (eicosanoic acid) fill in the unoccupied vacancies in the first layer. The magnitude of the dominant element of the nonlinear susceptibility and the average molecular orientation angle of the chromophore are determined by modeling the characteristic SHG Maker fringes.

Original languageEnglish (US)
Pages (from-to)1275-1282
Number of pages8
JournalLangmuir
Volume15
Issue number4
StatePublished - 1999
Externally publishedYes

Fingerprint

Langmuir Blodgett films
Iodides
Langmuir-Blodgett films
Harmonic generation
iodides
harmonic generations
Microscopic examination
Spectroscopy
microscopy
harmonics
Glass
glass
Eicosanoic Acids
spectroscopy
Amphiphiles
Molecules
Molecular orientation
Ellipsometry
Substrates
Chromophores

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Johal, M. S., Parikh, A. N., Lee, Y., Casson, J. L., Foster, L., Swanson, B. I., ... Robinson, J. M. (1999). Study of the Conformational Structure and Cluster Formation in a Langmuir-Blodgett Film Using Second Harmonic Generation, Second Harmonic Microscopy, and FTIR Spectroscopy. Langmuir, 15(4), 1275-1282.

Study of the Conformational Structure and Cluster Formation in a Langmuir-Blodgett Film Using Second Harmonic Generation, Second Harmonic Microscopy, and FTIR Spectroscopy. / Johal, M. S.; Parikh, A. N.; Lee, Y.; Casson, J. L.; Foster, L.; Swanson, B. I.; McBranch, D. W.; Li, D. Q.; Robinson, J. M.

In: Langmuir, Vol. 15, No. 4, 1999, p. 1275-1282.

Research output: Contribution to journalArticle

Johal, MS, Parikh, AN, Lee, Y, Casson, JL, Foster, L, Swanson, BI, McBranch, DW, Li, DQ & Robinson, JM 1999, 'Study of the Conformational Structure and Cluster Formation in a Langmuir-Blodgett Film Using Second Harmonic Generation, Second Harmonic Microscopy, and FTIR Spectroscopy', Langmuir, vol. 15, no. 4, pp. 1275-1282.
Johal, M. S. ; Parikh, A. N. ; Lee, Y. ; Casson, J. L. ; Foster, L. ; Swanson, B. I. ; McBranch, D. W. ; Li, D. Q. ; Robinson, J. M. / Study of the Conformational Structure and Cluster Formation in a Langmuir-Blodgett Film Using Second Harmonic Generation, Second Harmonic Microscopy, and FTIR Spectroscopy. In: Langmuir. 1999 ; Vol. 15, No. 4. pp. 1275-1282.
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