Scanning tunneling microscopy studies of self assembled nanostructures on graphite
Scanning tunneling microscopy studies of self assembled nanostructures on graphite
... Introduction Several studies of metals on graphite have demonstrated the fabrication of different types of nanostructures and behavior of metal atoms on graphite Ganz et al studied the growth of different ... interaction can alter particle shape significantly 1.1 Nucleation and Growth of nanostructures on Inert substrates The understanding of nucleation and growt...
Ngày tải lên: 14/09/2015, 12:09
Studies of self assembled monolayers on highly oriented pyrolytic graphite using scanning tunneling microscopy and computational simulation 1
... concept of the self- assembled monolayers (SAMs) is primarily introduced by Zisman in 19 46 [12 , 13 ] The traditional SAMs is an organized layer of INTRODUCTION amphiphilic molecules in which one ... development, and biological process Works of thiols adsorbed on gold surfaces by Nuzzo and Allara [13 , 15 ] in the early 19 80s and trichlorosilanes on silicon oxide by...
Ngày tải lên: 14/09/2015, 08:37
Studies of self assembled monolayers on highly oriented pyrolytic graphite using scanning tunneling microscopy and computational simulation 2
... Valiyaveettil Suresh’s group C12H25 C12H25 C12H25 N C12H25 C12H25 C12H25 N C12H25 C12H25 C12H25 C12H25 CPAH CHBC C12H25 Br N Br N C12H25 C12H25 C12H25 CHBC2 N C12H25 N C12H25 TCC 34 EXPERIMENTAL R ... C12H25 C12H25 N C12H25 C12H25 N C12H25 C12H25 CHBC3 Derivatives of perylene by Prof Valiyaveettil Suresh’s group C12H25 N O O O C12H25 N O O C12H25 N O S Br Br S O N O C12H25 O O DDPER N O C12...
Ngày tải lên: 14/09/2015, 08:37
Studies of self assembled monolayers on highly oriented pyrolytic graphite using scanning tunneling microscopy and computational simulation 3
... calibration of the “A” scanner for scanning tunneling microscope function 3. 3.2 Calibration Procedures The calibration of STM can be conducted with a standard sample: highly ordered pyrolytic graphite ... bright carbon atoms was 0.267nm 44 CALIBRATION Fig 3. 4 Section Analysis of the STM image in Fig 3. 3 along the orientation of the white arrow Fig 3. 5 shows the stand...
Ngày tải lên: 14/09/2015, 08:37
Studies of self assembled monolayers on highly oriented pyrolytic graphite using scanning tunneling microscopy and computational simulation 4
... to verify the existence of interaction between the adsorbate and graphite surface 4. 2 STM Results and Computational Simulations 4. 2.1 Solution Preparation Three solutions of fatty acids in phenyloctane ... interaction as shown in Table 4. 2 Our computational simulation does not reveal the physisorption route and steps of the monolayers formation, instead, it can onl...
Ngày tải lên: 14/09/2015, 08:37
Studies of self assembled monolayers on highly oriented pyrolytic graphite using scanning tunneling microscopy and computational simulation 5
... steric repulsion Fig 5. 4 The molecular model of the DDPER arrays 5. 4 The Computational Simulation 5. 4.1 Conformation of gas phase DDPER and its derivatives Building of the computational model started ... interaction 83 FORMATION OF SAMs CONRTOLLED BY STERIC EFFECTS 5. 4.2 DDPER/HOPG vs S170/HOPG Computational simulation was applied to compare the adsorption energies...
Ngày tải lên: 14/09/2015, 08:37
Studies of self assembled monolayers on highly oriented pyrolytic graphite using scanning tunneling microscopy and computational simulation 6
... 3.900.80nm and 2.950 .60 nm N N N Fig 6. 4 Left: High resolution image of HHB monolayers: Bright hexagons represent the benzene ring of HHB Right: the molecular configuration of HHB (R-HHB) in monolayers ... N Fig 6. 3 Left: High resolution image of HHB monolayers: Bright hexagons represent the benzene ring of HHB Right: the molecular configuration of HHB (L-HHB) in mon...
Ngày tải lên: 14/09/2015, 08:37
Studies of self assembled monolayers on highly oriented pyrolytic graphite using scanning tunneling microscopy and computational simulation 7
... be 7. 4.1 Concentration It is very obvious that the possibility of forming SAMs on HOPG is highly concentration dependent 1 k [ P] When the concentration of the molecule increases, (7- 7) ... observation and equation (7- 10), a rough diagram [Fig 7. 4] of the surface coverage vs [P] was proposed 1 17 FORMATION OF 2D CRYSTALS ON HOPG Fig 7. 4 Propsed diagram of sur...
Ngày tải lên: 14/09/2015, 08:37
morphology change of self-assembled zno 3d nanostructures with different ph
... and Physics 113 (2009) 389–394 391 Fig FE-SEM images of the ZnO 3D nanostructures synthesized at different pH: (a) pH 9.0; (b) pH 9.5; (c) pH 10.0; (d) pH 10.5; (e) pH 11.0; (f) pH 11.5; (g) pH ... Room-temperature photoluminescence spectra from the ZnO 3D nanostructures grown in solutions of different pH ( ex = 266 nm) quality of self-assembled ZnO...
Ngày tải lên: 06/05/2014, 13:24
Two dimensional molecular self assemblies on surfaces studied by low temperature scanning tunneling microscopy
... controls the molecular switching …………………………………………… 148 ⅹⅶ LIST OF ABBREVIATIONS 2D LT-STM Two- Dimensional Low Temperature Scanning Tunneling Microscopy STS Scanning Tunneling Spectroscopy MBE Molecular ... Field Ion Microscopy AFM Atomic Force Microscope SEM Scanning Electron Microscopy TEM Transmission Electron Microscopy NFSOM Near-Field Scanning Optical Mic...
Ngày tải lên: 11/09/2015, 09:58
STM investigations of self assembled bismuth nanostructures and ultra fine gold nanparticles
... STM INVESTIGATIONS OF SELF- ASSEMBLED BISMUTH NANOSTRUCTURES AND ULTRA- FINE GOLD NANOPARTICLES CHU XINJUN (M Tech., Peking Univ Tech.) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY ... High-resolution STM image (16 nm× nm) of an ultra- thin Bi NW with 16 PTCDA molecules on top The inset shows a 3-D view of part of this NW (b) Schematic diagram of...
Ngày tải lên: 11/09/2015, 10:16
STRUCTURES OF ADSORBED HALIDE ANIONS ON a COPPER ELECTRODE STUDIED BY IN SITU SCANNING TUNNELING MICROSCOPY
... electrode For the adsorption of iodide anions on the same substrate surface the supporting electrolyte (10 mM HCl) was replaced by STRUCTURES OF ADSORBED HALIDE ANIONS ON A COPPER ELECTRODE STUDIED ... IV CONCLUSION The electrochemical behaviors of a Cu(100) electrode in pure dilute HCl and iodide containing HCl solutions was investigated by in situ...
Ngày tải lên: 30/10/2015, 20:57
Morphology and growth mechanism study of self assembled silicon nanowires synthesized by thermal evaporation
... [10±13] and thermal evaporation [14±17] are two methods normally used for the synthesis of SiNWs The key point in these two methods is the formation of a sucient amount of silicon atoms and/ or silicon ... made of a Si core and a SiO2 sheath The one-dimensional growth of SiNWs is facilitated by the SiO2 sheath that con®nes the lateral growth of SiNWs, and the...
Ngày tải lên: 16/03/2014, 15:06
hydrothermal synthesis and characterization of self - assembled h - wo3
... sharp diffraction peaks (Fig 1a) are observed, indicative of high-degree crystallinity On the other hand, the as-synthesized h- WO3 with the NH4 + -based EDTA sample showed broader peaks with ... urchin-like (NH4 + -based EDTA) and (c) JCPDS card # 3 3-1 387, hydrothermally synthesized at 180 ◦ C for h solutions are shown in Fig For the as-synthesized h- WO3 with Na+ -based EDTA...
Ngày tải lên: 19/03/2014, 16:48
Báo cáo hóa học: " Thermal conductivity and viscosity of self-assembled alcohol/polyalphaolefin nanoemulsion fluids" ppt
... the thermal conductivity of liquids [12,35] Most of published thermal conductivity data on the nanofluids were obtained using the hot-wire Figure Alcohol/PAO nanoemulsion fluids (Bottle A) and ... Kang YT, Chen G: Thermal conductivity and viscosity of water-in-oil nanoemulsions Colloids Surf A Physicochem Eng Aspects 2008, 326:67-72 18 Tzou DY: Thermal instability...
Ngày tải lên: 21/06/2014, 04:20
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