Fabrication of P3HT/gold nanoparticle LB films by P3HT templating Langmuir monolayer

Liang Huei Chen, Wen Ping Hsu, Han Wen Chan, Yuh Lang Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Regioregular poly(3-hexyl thiophene) (rr-P3HT) and mixed P3HT/octadecyl amine (ODA) were used as template monolayers to adsorb the gold nanoparticles (AuNPs) dispersed in subphase. The behaviors of P3HT and P3HT/ODA monolayers were investigated by surface pressure area per molecule (π-A) isotherms, transmission electron microscopy (TEM) and atomic force microscopy (AFM). The experimental results show that P3HT does not form a homogeneous film and tends to aggregate at the air/water interface. Meanwhile, the amount of AuNPs adsorbed by the P3HT monolayers is low, attributable to the weak interaction between AuNPs and P3HT. By introduction of ODA molecules into the P3HT monolayer, the spreading of P3HT molecules at the air/water interface is improved and the aggregation of P3HT is significantly inhibited. A nearly uniform and homogeneously mixed P3HT/ODA monolayer can be obtained when 50% of ODA is introduced. It is also found that the introduction of ODA can significantly increase the adsorption of AuNPs. For the mixed monolayer with low ratio of ODA (P3HT/ODA = 1/0.2), a higher concentration of adsorbed AuNPs was observed on the corresponding monolayer. However, when the ODA/P3HT ratio increases to 1/1, the AuNPs tend to form three-dimensional (3D) aggregates and the AuNPs cannot distribute well as a homogeneous monolayer. This result is ascribed to the increasing hydrophobicity of the adsorbed AuNPs because of capping of more ODA molecules.

Original languageEnglish
Pages (from-to)736-741
Number of pages6
JournalApplied Surface Science
Volume320
DOIs
Publication statusPublished - 2014 Nov 30

Fingerprint

Langmuir Blodgett films
Gold
Amines
Monolayers
Nanoparticles
Fabrication
Molecules
Thiophenes
Water
Thiophene
Hydrophobicity
Air
Isotherms
Atomic force microscopy
Agglomeration
Transmission electron microscopy
Adsorption

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

Chen, Liang Huei ; Hsu, Wen Ping ; Chan, Han Wen ; Lee, Yuh Lang. / Fabrication of P3HT/gold nanoparticle LB films by P3HT templating Langmuir monolayer. In: Applied Surface Science. 2014 ; Vol. 320. pp. 736-741.
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Fabrication of P3HT/gold nanoparticle LB films by P3HT templating Langmuir monolayer. / Chen, Liang Huei; Hsu, Wen Ping; Chan, Han Wen; Lee, Yuh Lang.

In: Applied Surface Science, Vol. 320, 30.11.2014, p. 736-741.

Research output: Contribution to journalArticle

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