Ph. D. THESIS 2009

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(NA 1.25) in phase-contrast (a) and transmission (b). In figure 7 we can see SEM views of dots deposited at 6mW and 6s exposure time, recorder at 4000 order of magnitude and 5 m scale. We notice that the results essentially depend on the total amount of laser energy sent. As already discussed, we see that most of the produced dots are actually rings, only the extremely small ones can be dots without hole. Figure 7. (a) SEM image of a silver dots network fabricated at different laser powers and exposure time ; (b) Silver dot obtained at 6mW and 6s exposure time 3.6.2. 3D structures Three dimensional silver structures were fabricated using the same chemical system presented for dot and line fabrication. The TPA reduction of silver ions was performed within a 12 hours old thick film, obtained by deposition of a droplet of the solution on the substrate. The surface of a 2.5x2.5 cm microscope slide was modified with polyimide in order to improve the attachement of silver structure onto the surface during the fabrication [29]. The 3D structure was written using a 100x<strong>Ph</strong>3 immersed-oil objectiv lens with 1.25 NA, to deliver 4-5 mW of power to the sample. The lines can be generated by translating the stage in the XY-directions at a velocity of 0.5 m/s and a DT of 2 ms. Connection between XY translation and displacement of the sample holder in the Z-direction with a computer programm allowed to obtain a woodpile-like structure as a 10 degree tilted quadratic prism, with 20 m width of base along x and y axis, and 14.4 m total height. The three-dimensional object consists of 12 layers, each layer containing 6 lines with 4 m period, oriented alternatively, parallel, on X and Y, respectively. The height of each layer is about 1.2 m, with a 0.4 m step size for Z-axis and 3 integer dz-units. 5
Side 2 a Side 1 c d Figure 8. SEM images of representative rinsed silver woodpile structure at differentdegrees of magnification, for two different sides. Panels (a)-(d) show close-ups of side 1 and side 2, respectively: (a) 1600, (b) 3125, (c) 6000, (d) 6000. The images recorded with a magnitude of 12000 and 1m scale confirmed that silver beams have continuous surface but roughness. This can be, on a hand, a consequence of the technical “writing” conditions and the chemical system composition. On the other hand, silver is very reactiv and can undergo chemical changes in contact with atmosphere. Thus, the electroless plating is the best manner to prevent the silver corrosion. (2) TPA silver fabrication (1) hydrofobic glass coating surface 6 b (3) electroless plating Figure 9. Fabrication process: (1) Hydrophobic coating of the glass slides t o avoid gold deposition, (2) TPA silver structures fabrication, (3) gold coating by electroless plating. A uniform and smooth gold coating of the silver structures is achieved when using a 0.1M methanolic HAuCl4 solution. The methanolic HAuCl4 solution
Page 1 and 2:
“BABES-BOLYAI” UNIVERSITY CLUJ-
Page 3 and 4: General Introduction OUTLINE Part A
Page 5 and 6: 3.6.1. Dots 188 3.6.2. 3D structure
Page 7 and 8: Part A: Synthesis and Structural An
Page 9 and 10: H 3C H 3C O O O C C O O 1a O O C C
Page 11 and 12: The two forms are in equilibrium an
Page 13 and 14: Figu re 4 . Th e 13 C-NMR APT (CDCl
Page 15 and 16: set used , the anarmonicities that
Page 17 and 18: Figure 9. ORTEP diagram for the bic
Page 19 and 20: 1.5.1. Tetramethyl 3,7-dihydroxybic
Page 21 and 22: Table 7. The selected molecular par
Page 23 and 24: a b Figure 14. 1 H NMR spectrum (CD
Page 25 and 26: Figure 16. 13 C NMR spectrum APT (C
Page 27 and 28: Absorbance (a. u.) Absorbance (a.u.
Page 29 and 30: icyclo[3.3.1]nonane-3,7-dione solut
Page 31 and 32: m u lt ip let a t a t δ ==1 .7 6 p
Page 33 and 34: Figure 22. 13 C NMR APT spectrum of
Page 35 and 36: Figure 24. NMR investigation of the
Page 37 and 38: (mol·l -1 ) syn 8.8 x10 -3 1.4373
Page 39 and 40: a b Figure 29. 3D FTIR spectra in s
Page 41 and 42: Figure 32. ORTEP diagram for the cy
Page 43 and 44: H2 … N3 = 1.839 Å H5 … N6 = 1.
Page 45 and 46: 2. Conclusions of the part A Differ
Page 47: 20. L. J. Bellamy, “Advanced in I
Page 50 and 51: 2. Experimental part: fabrication a
Page 52 and 53: 3 m 30 m a b Figure 4. Optical imag
Page 56 and 57: was chosen instead of an aqueous on
Page 58 and 59: Our goal is to develope a lasser as
Page 60 and 61: Figure 15. a Optical image of gold
Page 62 and 63: the power as parameter exhibits a m
Page 64 and 65: a b Figure 21 a) Optical image of g
Page 66: 4.5.3. 3D structures The 3D structu
Page 69 and 70: Selected References 1. E. S. Wu, J.
Page 71: VIII. J. Bosson-Ehoomann, A. Mihut,
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Ph. D. THESIS 2009

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