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Volumn 128, Issue 42, 2006, Pages 13710-13719

Controlling gold atom penetration through alkanethiolate self-assembled monolayers on Au{111} by adjusting terminal group intermolecular interactions

Author keywords

[No Author keywords available]

Indexed keywords

ATOMIC FORCE MICROSCOPY; HYDROGEN BONDS; MONOLAYERS; ORGANIC COMPOUNDS; SELF ASSEMBLY; THERMAL EFFECTS; THIN FILMS; VAN DER WAALS FORCES; VAPOR DEPOSITION;

EID: 33750366570     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja060084x     Document Type: Article
Times cited : (60)

References (70)
  • 15
    • 33750307249 scopus 로고    scopus 로고
    • Ph.D. Thesis. Penn State University
    • Zhu, Z. Ph.D. Thesis. Penn State University, 2006.
    • (2006)
    • Zhu, Z.1
  • 49
    • 33750364271 scopus 로고    scopus 로고
    • note
    • The scan head has two separate z piezos. one for scan oft sets and coarse approach Z steps and another for scanning the z direction only. The tip approached the surface in tip-retract mode. The scan head would take one course z step with the z-scan piezo fully retracted. After the course z step was performed, the z-scan piezo is extended with a low gain ensuring that the tip moves at a low speed. If the tip extended into the surface, the approach would then stop. If no normal force change was detected, indicating the presence of the surface, the tip would be fully retracted again and another course Z step taken. This is repeated until the substrate surface is found; if faster approach modes are used, the metal tip will be blunted or other wise damaged leading to inconsistent contact areas and current measurements.
  • 50
    • 33750295920 scopus 로고    scopus 로고
    • note
    • The force distance curves are used as a relative measure of the tip radius of curvature. The higher the radius of curvature, the higher the surface area between the tip and the substrate is. For damaged tips the adhesive force was determined to be 5-20 times higher than that of new clean tips (∼10 nN). If a high adhesive force was found and was repeatable in different locations of the surface (done to ensure that the tip is not just at a local defect causing higher forces), then the tip was removed from vacuum, discarded, and replaced.
  • 56
    • 33750318212 scopus 로고    scopus 로고
    • note
    • - fragments during SIMS analysis. While we presently do not have data to confirm this mechanism, we note that these results do indicate that one can expect the behavior of alkanethiolate SAMs under Au deposition to vary according to the chemical purity.
  • 64
    • 33750367244 scopus 로고    scopus 로고
    • note
    • -10 nA was the high current limit set for the current amplifier for these experiments. The voltage was limited to -10 mV since higher voltages were found to create currents high enough to damage the tip: this high current can lead to complete demetallization of the contact area of the tip. This is unfortunate since higher voltages could be used to probe deeper into the monolayers enabling better imaging of filament growth beneath the alkanethiol surface.
  • 70
    • 0003998388 scopus 로고
    • Lide, E. R.; Ed. CRC Press: Boca Raton, FL
    • Lide, E. R.; Ed. Handbook of Chemistry and Physics; CRC Press: Boca Raton, FL, 1995; Vol. 1976. pp 12-19.
    • (1995) Handbook of Chemistry and Physics , vol.1976 , pp. 12-19


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.