Self-Assembly of a Novel Cationic Porphyrin-Anthraquione Hybrid Investigated by Scanning Tunneling Microscopy

2010 ◽  
Vol 148-149 ◽  
pp. 1273-1276 ◽  
Author(s):  
Ai Mei Gao ◽  
Wen Li Deng ◽  
Hong Yu Chen
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Self Assembly ◽  
Large Scale ◽  
Room Temperature ◽  
Pyrolytic Graphite ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Hybrid Compound ◽  
Cationic Porphyrin ◽  
Stm Images

The self-assembly behaviour of a novel cationic porphyrin-anthraquione (Por-AQ) hybrid ([AQATMPyP]I3) on highly oriented pyrolytic graphite (HOPG) was studied at room temperature in air by scanning tunneling microscopy(STM). According to theoretical calculation, it is testified that [AQATMPyP]I3 molecule mainly exists in the closed structure. The STM results reveal the presence of large-scale domains of ordered adlayer of this hybrid compound on HOPG. The STM images show a structure constituted by parallel rows. The width of each row is approximately 2.5nm.

scholarly journals The Effect of Deposition Time on the Surface Coverage of Sublimation Deposited Solid-Phase Glycine and Proline Molecules Measured by Scanning Tunneling Microscopy

Molecules ◽  
2020 ◽  
Vol 25 (13) ◽  
pp. 2962
Author(s):  
Young-Sang Youn
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Room Temperature ◽  
Deposition Time ◽  
Surface Coverage ◽  
Solid Phase ◽  
Scanning Tunneling ◽  
Adsorption Model ◽  
Tunneling Microscopy ◽  
Langmuir Adsorption ◽  
Stm Images

The effect of deposition time on the surface coverage of sublimation deposited solid-phase glycine and proline molecules onto a Ge(100) surface was studied at room temperature using scanning tunneling microscopy (STM). The STM images obtained at various coverages of glycine and proline adsorbed on the Ge(100) surface showed that (i) the adsorption rate for both molecules gradually decreased with increasing deposition time, obeying the Langmuir adsorption model, and (ii) the coverage of glycine on the Ge(100) surface is higher than that of proline under the same deposition conditions, which may be due to the differences in their molecular weight or molecular sticking probability.

scholarly journals Thermal evolution of the morphology of Ni/Ge(111)-c(2 × 8) surface

2014 ◽  
Vol 32 (4) ◽  
pp. 641-647 ◽  
Author(s):  
Agnieszka Tomaszewska ◽  
Jhen-Hao Li ◽  
Xiao-Lan Huang ◽  
Tsu-Yi Fu
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Room Temperature ◽  
Thermal Evolution ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Nucleation Sites ◽  
Dual Polarity ◽  
Stm Images

AbstractThe thermal evolution of the interface formed by room temperature (RT) deposition of Ni atoms (coverage 0.1, 0.5, 1.2 ML) onto a Ge(111)-c(2 × 8) surface has been studied with the use of scanning tunneling microscopy (STM). Atomically resolved STM images revealed that, at RT, the boundaries between the different c(2 × 8) domains acted as nucleation sites for Ni atoms. After annealing the surface with deposited material at 473 to 673 K the formation of nano-sized islands of NixGey compounds was observed. In addition, the occurrence of ring-like structures was recorded. Based on the dual-polarity images the latter were assigned to Ni atoms adsorbed on Ge adatoms.

Scanning Tunneling Microscopy Study of α,ω-Dihexylsexithiophene Adlayers on Au(111): A Chiral Separation Induced by a Surface

2012 ◽  
Vol 18 (4) ◽  
pp. 885-891 ◽  
Author(s):  
Yonghai Song ◽  
Yu Wang ◽  
Lingli Wan ◽  
Shuhong Ye ◽  
Haoqing Hou ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Self Assembly ◽  
Room Temperature ◽  
Three Dimensional ◽  
Microscopy Study ◽  
Molecular Structures ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Left Handed ◽  
Bulk Structure

AbstractThe self-assembly of α,ω-dihexylsexithiophene molecules on an Au(111) surface was examined by using scanning tunneling microscopy at room temperature, revealing the internal molecular structures of the sexithiophene backbones and the hexyl side chains. The α,ω-dihexylsexithiophene formed a large and well-ordered monolayer in which the molecule lay flatly on the Au(111) surface and was separated into two chiral domains. A detailed observation reveals that the admolecules were packed in one lamellae with their molecular axis aligned along the main axis of the Au(111) substrate with their hexyl chains deviated from ⟨110⟩ direction of the Au(111) substrate by 12 ± 0.5°. In contrast to the behavior in the three-dimensional bulk structure, flat-lying adsorption introduced molecular chirality: right- and left-handed molecules separate into domains of two different orientations, which are mirror symmetric with respect to the ⟨121⟩ direction of the Au(111) substrate. Details of the adlayer structure and the chiral self-assembly were discussed here.

The interaction of C60 with Si(111) and Co/Si(111)

2004 ◽  
Vol 815 ◽  
Author(s):  
M.A.K. Zilani ◽  
H. Xu ◽  
X.S. Wang ◽  
A.T.S. Wee
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
X Ray ◽  
Partial Decomposition ◽  
Regular Arrangement ◽  
Stm Images

AbstractWe have studied the interaction of C60 with clean Si(111) and sub-monolayer Co covered Si(111) using scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). Our STM results indicate that C60 has little mobility at room temperature (RT) on Co/Si(111). After annealing to 450 °C, STM images show a regular arrangement of partially decomposed C60. XPS reveals a partial decomposition of C60 on Co/Si(111) at 520 °C, and total decomposition to form a SiC-3×3 phase at 720 °C. These results show that Co catalyses C60 decomposition resulting in the formation of the ordered SiC-3×3 phase ∼200 °C below that on clean Si(111).

Cooperating dipole–dipole and van der Waals interactions driven 2D self-assembly of fluorenone derivatives: ester chain length effect

2017 ◽  
Vol 19 (46) ◽  
pp. 31113-31120 ◽  
Author(s):  
Meiqiu Dong ◽  
Kai Miao ◽  
Yi Hu ◽  
Juntian Wu ◽  
Jinxing Li ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Chain Length ◽  
Self Assembly ◽  
Pyrolytic Graphite ◽  
Van Der Waals Interactions ◽  
Scanning Tunneling ◽  
Two Dimensional ◽  
Tunneling Microscopy ◽  
Length Effect ◽  
Ester Chain

Two-dimensional supramolecular assemblies of a series of 2,7-bis(10-n-alkoxycarbonyl-decyloxy)-9-fluorenone derivatives (BAF-Cn, n = 1, 3–6) consisting of polar fluorenone moieties and ester alkoxy chains were investigated by scanning tunneling microscopy on highly oriented pyrolytic graphite surfaces.

ORGANOMETALLIC NANOSTRUCTURES OF 1,4-DIBROMO-2,5-DIIODOBENZENE BY METAL IONS CONSTRUCTION ON HOPG SURFACE

2016 ◽  
Vol 23 (04) ◽  
pp. 1650020 ◽  
Author(s):  
WEI LI ◽  
ZHONGPING WANG ◽  
XINLI LENG ◽  
YAN LU ◽  
XIAOQING LIU ◽  
...  
Keyword(s):  
Metal Ions ◽  
Scanning Tunneling Microscopy ◽  
Halogen Bond ◽  
Pyrolytic Graphite ◽  
Scanning Tunneling ◽  
Highly Oriented Pyrolytic Graphite ◽  
Tunneling Microscopy ◽  
Valence States ◽  
Different Shapes ◽  
Stm Images

Different organometallic nanostructures on highly oriented pyrolytic graphite (HOPG) have been synthesized by different metal ions coordinating with 1,4-Dibromo-2,5-diiodobenzene (C6H2Br2I2). Scanning tunneling microscopy (STM) images directly demonstrated the transformation of the nanostructure from self-assembled nanostructures formed by C6H2Br2I2 through halogen bond into organometallic network, formed by the dehalogenated C6H2Br2I2 molecules covalent bonded with metal ions. Moreover, by varying the concentrations of C6H2Br2I2 molecules or valence states of metal ions, organometallic structures with different shapes and sizes have been fabricated, which illustrates that the concentrations and valence states of the metal ions play important roles in the organometallic nanostructures.

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