Electrodeposition of long-chain alkylaryl layers on Au surfaces

Sun Lin, Ching Wei Lin, Jin Hao Jhang, Wei-Hsiu Hung

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

4-Alkylaryl layers were electrodeposited on Au surface via formation in situ of diazonium cations and the subsequent electroreduction in solution of 4-alkylanilines (4-CH 3(CH 2) nC 6H 4NH 2, n = 5-13). The electrodeposited layers were characterized with X-ray photoelectron spectra (XPS), an atomic force microscope (AFM), attenuated-total-reflection infrared spectra (ATR-IR), spectroscopic ellipsometry, and water contact angle. The thickness of the deposited alkylaryl layer increased with the length of the alkyl chain, which was about 1.6 times the molecular length of the alkylaniline precursor. The surfaces of deposited adlayers were uniform and smooth without aggregation and exhibited hydrophobic character with a water contact angle ∼95°. Charge transport across the alkylaryl layer was characterized with a measurement of a conductive AFM. The current-voltage characteristics at low voltages are describable with a nonresonant tunneling mechanism, according to which the resistance increased exponentially with the thickness of the adlayer. As a measure of the efficiency of the charge transport, the average attenuation factor (β) was 0.63 Å -1, which was less than that observed for the alkyl SAM because of the presence of the aryl ring. The breakdown voltage of the adlayer also increased with the length of the alkyl chain. The 4-tetradocylaryl layer exhibited a resistance and breakdown voltage comparable to that observed for a 1-octadecanethiolate SAM.

Original languageEnglish
Pages (from-to)17048-17054
Number of pages7
JournalJournal of Physical Chemistry C
Volume116
Issue number32
DOIs
Publication statusPublished - 2012 Aug 16

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Electric breakdown
Electrodeposition
electrodeposition
Contact angle
Charge transfer
Microscopes
Spectroscopic ellipsometry
Water
Current voltage characteristics
Photoelectrons
Cations
electrical faults
Agglomeration
Positive ions
Infrared radiation
X rays
microscopes
methylidyne
Electric potential
atomic spectra

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Electrodeposition of long-chain alkylaryl layers on Au surfaces. / Lin, Sun; Lin, Ching Wei; Jhang, Jin Hao; Hung, Wei-Hsiu.

In: Journal of Physical Chemistry C, Vol. 116, No. 32, 16.08.2012, p. 17048-17054.

Research output: Contribution to journalArticle

Lin, Sun ; Lin, Ching Wei ; Jhang, Jin Hao ; Hung, Wei-Hsiu. / Electrodeposition of long-chain alkylaryl layers on Au surfaces. In: Journal of Physical Chemistry C. 2012 ; Vol. 116, No. 32. pp. 17048-17054.
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abstract = "4-Alkylaryl layers were electrodeposited on Au surface via formation in situ of diazonium cations and the subsequent electroreduction in solution of 4-alkylanilines (4-CH 3(CH 2) nC 6H 4NH 2, n = 5-13). The electrodeposited layers were characterized with X-ray photoelectron spectra (XPS), an atomic force microscope (AFM), attenuated-total-reflection infrared spectra (ATR-IR), spectroscopic ellipsometry, and water contact angle. The thickness of the deposited alkylaryl layer increased with the length of the alkyl chain, which was about 1.6 times the molecular length of the alkylaniline precursor. The surfaces of deposited adlayers were uniform and smooth without aggregation and exhibited hydrophobic character with a water contact angle ∼95°. Charge transport across the alkylaryl layer was characterized with a measurement of a conductive AFM. The current-voltage characteristics at low voltages are describable with a nonresonant tunneling mechanism, according to which the resistance increased exponentially with the thickness of the adlayer. As a measure of the efficiency of the charge transport, the average attenuation factor (β) was 0.63 {\AA} -1, which was less than that observed for the alkyl SAM because of the presence of the aryl ring. The breakdown voltage of the adlayer also increased with the length of the alkyl chain. The 4-tetradocylaryl layer exhibited a resistance and breakdown voltage comparable to that observed for a 1-octadecanethiolate SAM.",
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AB - 4-Alkylaryl layers were electrodeposited on Au surface via formation in situ of diazonium cations and the subsequent electroreduction in solution of 4-alkylanilines (4-CH 3(CH 2) nC 6H 4NH 2, n = 5-13). The electrodeposited layers were characterized with X-ray photoelectron spectra (XPS), an atomic force microscope (AFM), attenuated-total-reflection infrared spectra (ATR-IR), spectroscopic ellipsometry, and water contact angle. The thickness of the deposited alkylaryl layer increased with the length of the alkyl chain, which was about 1.6 times the molecular length of the alkylaniline precursor. The surfaces of deposited adlayers were uniform and smooth without aggregation and exhibited hydrophobic character with a water contact angle ∼95°. Charge transport across the alkylaryl layer was characterized with a measurement of a conductive AFM. The current-voltage characteristics at low voltages are describable with a nonresonant tunneling mechanism, according to which the resistance increased exponentially with the thickness of the adlayer. As a measure of the efficiency of the charge transport, the average attenuation factor (β) was 0.63 Å -1, which was less than that observed for the alkyl SAM because of the presence of the aryl ring. The breakdown voltage of the adlayer also increased with the length of the alkyl chain. The 4-tetradocylaryl layer exhibited a resistance and breakdown voltage comparable to that observed for a 1-octadecanethiolate SAM.

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