Benzilamin İnce Filmleri İle Kovalent Bir Şekilde Modifiye Edilmiş Silisyum Yüzeyleri Üzerinde Sitrat-Kaplı Altın Nanopartiküllerin Üretimi ve Karakterizasyonu

Öz

Bu çalışmada, benzilamin ince filmleri ile kovalent bir şekilde modifiye edilmiş yüzeyler üzerinde sitrat-kaplı altın nanopartiküllerin üretimi amaçlanmıştır. Bu amaçla ilk olarak, p-tipi Si (100) elektrotlar aril diazonyum tuzlarının elektrokimyasal indirgenmesi (+N₂-benzilamin) ile benzilamin tabakaları ile modifiye edilmiştir. Daha sonra, modifiye edilmiş elektrotlar altın nanopartikül içeren bir çözelti içine daldırılmıştır. Son olarak, Au nanopartiküller elektrostatik olarak pozitif yüklü benzilamin tabakaları ile birleştirilmiştir. Benzilamin filmlerin özellikleri voltametrik yöntemler kullanılarak incelenmiştir. Modifiye edilmiş p-tipi Si (100) yüzeylerinin bariyer özellikleri redoks probların varlığında (Fe(CN)₆^3- ve Ru(NH₃)₆³⁺) dönüşümlü voltametri kullanılarak çalışılmıştır. Ayrıca elde edilen sonuç filmlerin karakterizasyonu ve morfolojik analizi taramalı elektron mikroskopu (SEM) ile araştırılmıştır.

Anahtar Kelimeler

• Benzilamin,sitrat-kaplı altın nanopartikül,kovalent modifikasyon

Synthesis and Characterization of Citrate-Capped Gold Nanoparticles on Covalently Modified Silicon Surfaces by Benzylamine Thin Films

Öz

In this study, we aimed to assembly of citrate-capped gold nanoparticles on benzylamine thin films that covalently modified surfaces. For this purpose, firstly, p-type Si (100) electrodes were modified with benzylamine layers by electrochemical reduction of aryl diazonium salts        (+N₂-benzylamine). Then, the modified electrodes were submerged in a solution containing Au nanoparticles. Finally, Au nanoparticles were electrostatically assembled on positively charged benzylamine layers. The properties of the benzylamine films were investigated using voltammetric methods. The barrier properties of modified p-type Si (100) surfaces were studied by cyclic voltammetry in the presence of redox probes (Fe(CN)₆^3- and Ru(NH₃)₆³⁺). Also the final films generated for characterization and morphological analysis were examined by scanning electron microscopy (SEM). 

Anahtar Kelimeler

• Benzylamine,citrate-capped gold nanoparticles,covalent modification

Kaynakça

1. [1] Katz, E., Willner, I., Wang, J., “Electroanalytical and Bioelectroanalytical Systems Based on Metal and Semiconductor Nanoparticles”, Electroanal, 16: 19-26, (2004).
2. [2] Dobrzanski, L.A., Pawlyta, M., Krzton, A., Lizzka, B., Labizz, K., “Synthesis and Characterization of Carbon Nanotubes Decorated with Platinum Nanoparticles”, J. Achiev. Mater. and Manuf. Eng., 39: 2, (2010).
3. [3] Honciuc, A., Jaiswal, A., Gong, A., Ashworth,K., Spangler, C.W., Peterson, R., Dalton, L., Metzger,R.M., “Current Rectification in a Langmuir-Schaefer Monolayer of Fullerene-bis-[4-diphenylamino-4-(N-ethyl-N 2-ethyl)amino-1,4-diphenyl-1,3-butadiene] Malonate between Au Electrodes”, J. Phys. Chem. B, 109: 857-871, (2005).
4. [4] Metzger, R.M., Chen, B., Ho1pfner, U., Lakshmikantham, M.V., Vuillaume, D., Kawai, T., Wu, X., Tachibana, H., Hughes, T.V., Sakurai, H., Baldwin, J.W., Hosch, C., Cava, M.P., Brehmer, L., Ashwell, G.J., 1997. “Unimolecular Electrical Rectification in Hexadecylquinolinium Tricyanoquinodimethanide”, J. Am. Chem. Soc, 119: 10455-10466, (1997).
5. [5] Blum, A.S., Kushmerick, J.G., Long, D.P., Patterson, C.H., Yang, J. C., Henderson, J.C., Yao, Y.X., Tour, J.M., Shashidhar, R., Ratna, B.R., “Molecularly Inherent Voltage-Controlled Conductance Switching”, Nature Materials, 4: 167-172, (2005).
6. [6] Collier, C.P., Jeppesen, J.O., Luo, Y., Perkins, J., Wong, E.W., Heath, J.R., Stoddart, J.F., “Molecular-Based Electronically Switchable Tunnel Junction Devices”, J. Am. Chem. Soc, 123: 12632-12641, (2001).
7. [7] Moore, A. M., Dameron, A. A., Mantooth, B. A., Smith, R. K., Fuchs, D. J. , Ciszek, J. W., Maya, F., Yao, Y., Tour, J.M., Weiss, P.S., “Molecular Engineering and Measurements to Test Hypothesized Mechanisms in Single Molecule Conductance Switching”, J. Am. Chem. Soc, 128, 1959-1967, (2006).
8. [8] Bernard, M.C., Chausse, A., Cabert-Deliry, E., Chemimi, M.M., Pinson, J., Podvorica, F., Vautrin-U, C., “Organic Layers Bonded to Industrial, Coinage, and Noble Metals through Electrochemical Reduction of Aryldiazonium Salts”, Chem. Mater, 15: 3450-3462, (2003).

9. [9] Delamarche, E., Michel, B., Kong, H., Gerber, C.,“Thermal Stability of Self- Assembled Monolayers”, Langmuir, 10: 4103-4108, (1994).
10. [10] Yourdshahyan, Y. and Rappe, A. M., “Structure and Energetics of Alkanethiol Adsorption on The Au (111) Surface”, J. Chem. Phys, 117: 825-833, (2002).
11. [11] Obeng, Y.S., Bard, A.J., “Langmuir Films of C60 at the Air-Water Interface”, J. Am. Chem. Soc, 113: 6279-6280, (1991).
12. [12] Graves-Abe, T., Bao, Z., Sturm, J.C., “Self-Aligned, Insulating-Layer StructureforIntegrated Fabrication of Organic Self-Assembled Multilayer Electronic Devices”, Nano Letters, 4(12): 2489-2492, (2004).
13. [13] Green, J.E., Choi, J.W., Boukai, A., Bunimovich, Y., Halperin, E.J., DeIonno, E., Luo, Y., Sheriff, B.E., Xu, K., Shin, Y.S., Tseng, H.R., Heath, J., “160-Kilobit Molecular Electronic Memory Patterned at 10” Bits Per Square Centimeter”, Nature, 445: 414-417, (2007).
14. [14] Delamar, M., Hitmi, R., Pinson, J., Saveant, J.M., “Covalent Modification of Carbon Surfaces by Grafting of Functionalized Aryl Radicals Produced from Electrochemical Reduction of Diazonium Salts”, J. Am. Chem. Soc, 114: 5883-5884, (1992).
15. [15] Dunker, M. F. W., Starkey, E. B., Jenkins, G. L., “The Preparation of Some Organic Mercurials from Diazonium Borofluorides”, J. Am. Chem. Soc, 58: 2308–2309, (1936).
16. [16] Graber, K.C., Freman, R.G., Hommer, M.B., Natan, M.C., “Preparation and Characterision of Au Colloid Monalayers”, Anal. Chem, 69(4): 735-743, (1995).
17. [17] Swalen, J.D., Rabolt, J.F., “In Fourier Transform Infrared Spectroscopy” Academic Press, New York, 4: (1997).
18. [18] Saby, C., Ortiz, B., Champagne, G.Y., Belanger, D., “Electrochemical Modification of Glassy Carbon Electrode Using Aromatic Diazonium Salts. 1. Blocking Effect of 4-Nitrophenyl and 4-Carboxyphenyl Groups”, Langmuir, 13: 6805-6813, (1997).
19. [19] Kim, K., Lee, I., “Chemical Lithography by Ag-Nanoparticle-Mediated Photoreduction of Aromatic Nitro Monolayers on Au”, Langmuir, 20: 7351-7354, (2004).
20. [20] Mendes, P. M., Jacke, S., Critchley, K., Plaza, J., Chen, Y., Nikitin, K., Palmer, R. E., Preece, J. A., Evans, S. D., Fitzmaurice, D., “Gold Nanoparticle Patterning of Silicon Wafers using Chemical e-Beam Lithography”, Langmuir, 20: 3766-3768, (2004).