Nanocomposites by electrostatic interactions: 1. Impact of sublayer quality on the organization of functionalized nanoparticles on charged self-assembled layers

Langmuir

Volumn 16, Issue 20, 2000, Pages 7554-7557

  Auer, Frank ^a   Scotti, Michael ^b   Ulman, Abraham ^b   Jordan, Rainer ^b,d   Sellergren, Börje ^a   Garno, Jayne ^c   Liu, Gang Yu ^c  

^a JOHANNES GUTENBERG UNIVERSITY   (Germany)

^b POLYTECHNIC UNIVERSITY   (United States)

^c WAYNE STATE UNIVERSITY   (United States)

^d TECHNICAL UNIVERSITY OF MUNICH   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

ATOMIC FORCE MICROSCOPY; DENSITY (SPECIFIC GRAVITY); DEPOSITION; ELLIPSOMETRY; FOURIER TRANSFORM INFRARED SPECTROSCOPY; GOLD; MOLECULAR DYNAMICS; MOLECULAR STRUCTURE; MONOLAYERS; OPTICAL PROPERTIES; ORGANIC ACIDS; SURFACE TREATMENT;

BISBENZAMIDINES; CHARGED SELF ASSEMBLED LAYERS; ELECTROSTATIC INTERACTIONS; MERCAPTOHEXADECANOIC ACID; PACKING DENSITY;

NANOSTRUCTURED MATERIALS;

EID: 0034300095     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la000647x     Document Type: Article

References (23)

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15. 10-SH (mercaptoundecanoic acid) was added, upon which the color turned from yellow-gold to a cloudy, opaque, dark yellow-brown after 30 s. Next, 10 mL of acetic acid was added, with no color change observed. This solution was stirred for 10 min and then was reduced by slow addition of a 0.89 M solution of sodium borohydride to the flask. Upon addition of the reducing agent, solution turned immediately black, indicating the formation of the gold nanoparticles. The solution was left to stir for 3 h more. The solvent was then evaporated to approximately 10 mL, and the black residue was washed with diethyl ether three times to remove free thiol. Next, the residue was washed three times with water and then with methanol and put to dry on a vacuum line with heat overnight, (b) Johnson, S. R.; Evans, S. D.; Brydson, R. Langmuir 1998, 14, 6639-6647
16. Planar gold substrates were prepared according to: Jordan, R.; Ulman, A. J. Am. Chem. Soc. 1998, 120, 243-247. The MHA SAMs were prepared according to ref 6.
17. The thickness values for the MHA and bis-benzamidine layers were calculated using a refractive index of 1.45. Each value is the arithmetical mean value of 10 measurements on three individual spots of each substrate. Errors of given optical thickness were as follows: d(MHA) was ±0.2 nm, d(PAM, OAM, DODAM) was ±0.3 nm, and d(particle layer) was ±0.5 nm as estimated from the standard deviations.
18. Complex refractive index N of bulk Au at λ = 632.8 nm (N = n - ik) with n = 0.166 and k = 3.15 from: Palik, E. D., Ed. Handbook of Optical Constants of Solids; Academic Press: Orlando, FL, 1985. Or recently, n = 0.197; k = 3.45 from: Innes, R. A.; Sambles, J. R. J. Phys. F: Met. Phys. 1987, 17, 277.
19. Complex refractive index N of bulk Au at λ = 632.8 nm (N = n - ik) with n = 0.166 and k = 3.15 from: Palik, E. D., Ed. Handbook of Optical Constants of Solids; Academic Press: Orlando, FL, 1985. Or recently, n = 0.197; k = 3.45 from: Innes, R. A.; Sambles, J. R. J. Phys. F: Met. Phys. 1987, 17, 277.
20. Brust, M.; Bethell, D.; Kiely, C. J.; Schiffrin, D. J. Langmuir 1998, 14, 5425-5429.
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22. -1 resolution in transmission mode accumulating 200 scans. Solid samples of modified nanoparticles were prepared as a KBr pellet. The monolayer spectra of the self-assembled monolayers were recorded by external reflection FTIR additionally using a SpectraTech FT-80 grazing angle setup at 80° angle of incidence in p-polarization.
23. Auer, F.; Scotti, M.; Jordan, R.; Ulman, A.; Sellergren, B.; White, H.; Rafailovich, M.; Sokolov, J. In preparation.