Studies of self assembled monolayers on highly oriented pyrolytic graphite using scanning tunneling microscopy and computational simulation 6

... 3.900.80nm and 2.950 .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 monolayers (Vbias = 100mV, and Iset ... Fig 6. 8 Illustration of physisorption of HHB molecule onto HOPG surfaces 102 ADSORPTION-INDUCED CHIRAL SAMs The physisorption process can be considered as an addition reaction between the HHB and...

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 Maoz and Sagiv [13 , 16 ] introduced ... deposited onto the substrate surface from either vapor or liquid phase A typical example is that the formation of thiolate monolayers on the gold (11 1) surface (Fig 1. 3) Fig 1. 3 Schematic of an n-dodecanethiolate...

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 C12H25 S170 ... C12H25 C12H25 N O O C12H25 N O OMe OMe MeO OMe MeO MeO OMe OMe O N O C12H25 S169 O N O C12H25 S1 72 36 EXPERIMENTAL O C12H25 N O O C12H25 N O OCH3 OCH3 H3CO S S H3CO OCH3 OCH3 O N O C12H25 SIV233...

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 standard parameters of the graphite ... finds useful applications such as the production and detection of sound, generation of high voltages, electronic frequency generation, microbalance, and ultra fine focusing of optical assemblies...

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 only provide the energies of the final ... about the configuration of two species within the 63 PHYSISORPTION OF BINARY FATTY ACIDS ON HOPG monolayers formed by the binary acids solution Fig 4. 9 Top view of Model A and B with graphite lattice...

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 of DDPER and S170 on graphite ... Section analysis showed that the DDPER centers had an average relative height of 0.2 nm (Fig 5. 3) Fig 5. 3 The height profile of the DDPER Self- Assembled Monolayers 78 FORMATION OF SAMs CONRTOLLED...

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 surface coverage  vs solution ... growth of SAMs on HOPG Although the graphite surface has a high degree of perfection, they still have steps and defects, as shown in Fig 7. 1 112 FORMATION OF 2D CRYSTALS ON HOPG Fig 7. 1 STM image of...

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 growth of self- assembled nanostructures on solid ... characterize self- assembled nanostructures for fundamental interests along with several applications in the field of nanodevices [1113] The shape, size and location of self- assembled nanostructures...

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 Microscopy LEEM Low- Energy Electron Microscopy ... are demonstrated by low- temperature scanning tunneling microscopy (LT-STM) in ultra-high vacuum (UHV) environments Intensive effort is devoted to construct mono- and bi-component organic molecular...

báo cáo khoa học: "Regulated growth of diatom cells on self-assembled monolayers" potx

... http://www.jnanobiotechnology.com/content/5/1/2 Figure The velocity of diatom cells moving on SAM surfaces The velocity of diatom cells moving on SAM surfaces (A) One day of incubation (B) Three days of incubation Page 11 of ... Histogram of the moved and unmoved diatom cells on SAM surfaces Histogram of the moved and unmoved diatom cells on SAM surfaces (A) One day of incubation, unrinsed (B) Three days of incubation, unrinsed ... studying the adhesion strength between SAMs and diatoms and not on the growth of diatom cells on SAMs In general, cell researches but in diatom researches, many examples of cell adhesion onto chemically...

tribology of organic self assembled monolayers (SAMs) and thin films on si surface

... K Sinha and M P Srinivasan, “Friction and wear life evaluation of silane-based self- assembled monolayers on silicon surface , “Life Cycle Tribology (Editors: D Dowson, M Priest, G Dalmaz and ... strength of selfassembled monolayers with Si substrate on wear resistance”, Proceedings of the Nano Sikkim 2: Friction and Biotribology, International Conference conducted by International Nanotribology ... development of ultra -thin films (SAMs and polymer thin films of composite and hybrid nature) on Si surface (with the aim of low friction and high wear durability) and the evaluation of their tribological...

Báo cáo hóa học: " A Study on Field Emission Characteristics of Planar Graphene Layers Obtained from a Highly Oriented Pyrolyzed Graphite Block" potx

... electrons are emitted from the graphene tip creating an electron current that can be modulated on and off Fig Fabrication process of graphene sheets using a mechanical exfoliation method The graphene ... vacuum chamber, two tungsten tips were located on the graphene sample; one was contacted directly to the sample and grounded as a cathode, and the other was placed an arbitrary distance, d, apart ... ﬁeld-enhancement factor, u: work function, A: area, ": reduced Planck h constant, and m: electron mass Assuming the work function of graphene is eV and the gap between the graphene sheet and the nanomanipulator...

Báo cáo hóa học: " Binary Mixtures of SH- and CH3-Terminated Self-Assembled Monolayers to Control the Average Spacing Between Aligned Gold Nanoparticles" doc

... control of the thiols in the binary mixture solution of SH- and CH3-terminated silanes Nanoscale Res Lett (2009) 4:1319–1323 Conclusions We have introduced a method to control the average spacing between ... between aligned OMCVD-grown Au NPs by varying the volume% of SH-terminated silane in a binary mixture of SH- and CH3-terminated groups CH3-terminated molecules were used to dilute and control the ... OTS(v%) Fig Average center -to- center spacing between aligned Au NPs at doses of 0.5, 1.0, 4.0, and 11 nC/cm versus the v/v% ratio of MPTS/ OTS binary mixture The error bars represent the standard...

Báo cáo hóa học: " Formation and Organization of Amino Terminated Self-assembled Layers on Si(001) Surface" docx

... the formation mechanisms Two alternative pathways, formation of oligomers and then adsorption and reorientation (two-dimensional networking) on the surface is one of the mechanisms that one can ... variation of water contact angle of the Si(001) surfaces as a function of the TPDA concentration after treatment is quite signiﬁcant For example, in the cases of 0.5 and 2% TPDA concentrations, ... ﬁndings demonstrated in the previous paragraphs Effect of TPDA Concentration The effect of TPDA concentration on the ﬁlm thicknesses and water contact angles on the hydroxylated silicon surface...

Studying properties of nano scale moieties using functionalized self assembled monolayers

... STUDYING PROPERTIES OF NANO- SCALE MOIETIES USING FUNCTIONALISED SELF- ASSEMBLED MONOLAYERS AH QUNE LLOYD FOONG NIEN ( B.SC (HONS) NUS ) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY ... Self- Assembled Monolayers The ends of alkane thiols can further be functionalized with moieties of interest to prepare functionalized self- assembled monolayers The ability of the alkane thiols to self- assemble ... azobenzene dithiols Studying the nano- scale properties of each of these three moieties or systems individually would be a formidable task Yet the formation of a monolayer of the desired nano- scale moiety...

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