Characterization of alkyl monolayer covalently bonded to Si(111) and soft-landing of vanadium-benzene sandwich clusters onto the alkyl monolayer substrate

Matsumoto, Takeshi; Nagaoka, Shuhei; Ikemoto, Kaori; Mitsui, Masaaki; Ara, Masato; Tada, Hayato; Nakajima, Atsushi

doi:10.1140/epjd/e2009-00069-9

Cited by 10 publications

(11 citation statements)

References 28 publications

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“…This intact deposition of projectile ions impinging on surfaces at low collision energies (<100 eV) was referred to as soft-landing, and this process may occur with or without retention of the initial ion charge [2][3][4]. Experiments of soft-landing have involved a wide variety of projectile ions, including small and medium-size polyatomic ions [1,[5][6][7][8][9][10][11][12], clusters [13][14][15][16][17][18][19][20][21][22][23][24], peptides [11,23,[25][26][27][28][29][30], proteins [25,31,32], a nucleotide [33], and intact viruses [34,35]. SAMs were used in many of these experiments because their well-characterized structure, controllable surface properties and biocompatibility make them convenient targets for biological and medical applications [36].…”

Section: Introductionmentioning

confidence: 99%

Intermolecular potentials for simulations of collisions of SiNCS+ and (CH3)2SiNCS+ ions with fluorinated self-assembled monolayers

et al. 2012

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Analytical potential energy functions were developed for interactions of SiNCS + and (CH 3) 2 SiNCS + ions with perfluorinated self-assembled monolayer (F-SAM) surfaces. Two model compounds were used to represent an F-SAM: CF 4 and nine chains of perfluorobutane forming a miniSAM structure. Density functional theory plus dispersion (DFT-D) calculations were carried out to compute intermolecular potential energy curves (IPECs) for these systems. The applied DFT-D method (specifically, B97-D) was successfully tested against high-level wavefunction calculations performed on the smallest system investigated. The IPECs calculated at the B97-D level were fitted to analytical potentials of the Buckingham type. The calculations show that the parameters obtained from the fits involving CF 4 are transferable to the miniSAM system, provided the fittings are conducted with caution, thus corroborating that CF 4 is a good model for parameterizing intermolecular potentials for interactions of gases with F-SAM surfaces.

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Section: Introductionmentioning

confidence: 99%

Intermolecular potentials for simulations of collisions of SiNCS+ and (CH3)2SiNCS+ ions with fluorinated self-assembled monolayers

et al. 2012

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“…SAMs prepared on gold are well ordered and more densely populated than those on silicon. Therefore, the desorption energy of V(benzene)-complex ions from a C 16 -SAM prepared on Si(111) is much lower than that of a C 16 -SAM prepared on Au(111) (142). The orientation of the molecules following landing depends on the nature of the SAM.…”

Section: Soft Landing and Its Applications In Organometallicsmentioning

confidence: 99%

“…In other studies, ions of transition metals such as titanium, scandium, and chromium were deposited at room temperature onto different SAMs (141,142). The collision energy ranged between 10 and 20 eV.…”

Section: Soft Landing and Its Applications In Organometallicsmentioning

confidence: 99%

Probing Molecular Solids with Low-Energy Ions

Bag

Bhuin

Natarajan

et al. 2013

Annual Rev. Anal. Chem.

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Ion/surface collisions in the ultralow-to low-energy (1-100-eV) window represent an excellent technique for investigation of the properties of condensed molecular solids at low temperatures. For example, this technique has revealed the unique physical and chemical processes that occur on the surface of ice, versus the liquid and vapor phases of water. Such instrumentdependent research, which is usually performed with spectroscopy and mass spectrometry, has led to new directions in studies of molecular materials. In this review, we discuss some interesting results and highlight recent developments in the area. We hope that access to the study of molecular solids with extreme surface specificity, as described here, will encourage investigators to explore new areas of research, some of which are outlined in this review.

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“…In the IRAS spectra, three absorption peaks were observed and the frequencies of these IR absorption bands are in good agreement with the IR fundamentals for the neutral Cr-(benzene) 2 sandwich complexes in a KBr pellet. 26, 28 The three vibrations were therefore assigned to ring breathing at 972 cm À1 (A 2u ), CH in-plane bending at 998 cm À1 (E 1u ), and CC ring stretching and deforming at 1427 cm À1 (E 1u ). These results indicate that the soft-landed Cr(benzene) 2 cation complexes lost their charge, and the resulting neutral complexes were deposited on the both palmitic acid monolayers with their native sandwich structure intact.…”

Section: Infrared Spectroscopic Study Of Soft-landed Clustersmentioning

confidence: 99%

Physical Properties of Aliphatic Monolayer on Indium–Tin Oxide and SnO₂(110) Relevant to Thermal Stability of Soft-Landed Cr(benzene)₂

et al. 2011

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The physical properties of surface modified indium–tin oxide (ITO) and SnO2(110) with an adsorbed aliphatic chain monolayer were studied by soft-landing experiments coupled with infrared (IR) spectroscopy, temperature programmed desorption (TPD) spectroscopy, and scanning probe microscopy. The IR spectra showed that the aliphatic chains of palmitic acid on both the metal oxide surfaces form a crystalline-phase monolayer with an all-trans conformation at room temperature. Gas-phase synthesized Cr(benzene)2 cations deposited with a hyperthermal energy (20 eV) were used to probe the surface morphology. The IR spectrum after deposition showed that the cations soft-landed after being neutralized and oriented to cant the molecular axes far from the surface normal direction through penetration into the monolayer matrix. The TPD spectrum showed that the desorption activation energy of Cr(benzene)2 from an aliphatic monolayer on ITO is much lower than that from the aliphatic monolayer on SnO2 or a self-assembled monolayer of alkanethiol on Au(111). The lower thermal stability of Cr(benzene)2 on the aliphatic monolayer on ITO can be ascribed to considerable surface roughness of the ITO itself, which can be characterized by scanning probe microscopy.

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Characterization of alkyl monolayer covalently bonded to Si(111) and soft-landing of vanadium-benzene sandwich clusters onto the alkyl monolayer substrate

Cited by 10 publications

References 28 publications

Intermolecular potentials for simulations of collisions of SiNCS+ and (CH3)2SiNCS+ ions with fluorinated self-assembled monolayers

Intermolecular potentials for simulations of collisions of SiNCS+ and (CH3)2SiNCS+ ions with fluorinated self-assembled monolayers

Probing Molecular Solids with Low-Energy Ions

Physical Properties of Aliphatic Monolayer on Indium–Tin Oxide and SnO₂(110) Relevant to Thermal Stability of Soft-Landed Cr(benzene)₂

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Characterization of alkyl monolayer covalently bonded to Si(111) and soft-landing of vanadium-benzene sandwich clusters onto the alkyl monolayer substrate

Cited by 10 publications

References 28 publications

Intermolecular potentials for simulations of collisions of SiNCS+ and (CH3)2SiNCS+ ions with fluorinated self-assembled monolayers

Intermolecular potentials for simulations of collisions of SiNCS+ and (CH3)2SiNCS+ ions with fluorinated self-assembled monolayers

Probing Molecular Solids with Low-Energy Ions

Physical Properties of Aliphatic Monolayer on Indium–Tin Oxide and SnO2(110) Relevant to Thermal Stability of Soft-Landed Cr(benzene)2

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Physical Properties of Aliphatic Monolayer on Indium–Tin Oxide and SnO₂(110) Relevant to Thermal Stability of Soft-Landed Cr(benzene)₂