Low-Energy Ionic Collisions at Molecular Solids

Cyriac, Jobin; Pradeep, Thalappil; Kang, Heon; Souda, Ryūtarō; Cooks, R. Graham

doi:10.1021/cr200384k

Cited by 110 publications

(162 citation statements)

References 611 publications

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“…They can also be followed with other well-known detection techniques. Several reviews on this topic are available (48,74,81,86,(107)(108)(109). Below, we describe some of these studies to illustrate recent developments.…”

Section: Wwwannualreviewsorg • Probing Molecular Solids With Low-enmentioning

confidence: 99%

“…The translational diffusion in the film indicates that a liquid-like phase may appear immediately before crystallization. Another interesting aspect of such films is that they form droplets after crystallization, and their dewetting temperature depends on their initial thickness (86).…”

Section: The Phase Transitionmentioning

confidence: 99%

“…The T g values of thin films are expected to be lower than bulk T g values because of the nanoconfinement effect, which is similar to the lowering of melting point of such confined crystallites (86,133,134). To observe the substrate and the free-surface effect on the T g value of ASW, investigators vapor-deposited water at 120 K on graphite and other ionic liquids (131).…”

Section: The Phase Transitionmentioning

confidence: 99%

“…Without breaking the covalent bond, the polyatomic ions dissipate the kinetic energy during impact, and the dissipated energy changes the vibrational and electronic energy of the surface and the polyatomic ions. Soft-landing experiments play an important role in the fields of materials science, engineering, catalysis, nanotechnology, and biology (86). In 1977, the Cooks group became the first to conduct a soft-landing experiment (75).…”

Section: Soft Landing and Its Applications In Organometallicsmentioning

confidence: 99%

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Probing Molecular Solids with Low-Energy Ions

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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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Section: Wwwannualreviewsorg • Probing Molecular Solids With Low-enmentioning

confidence: 99%

Section: The Phase Transitionmentioning

confidence: 99%

Section: The Phase Transitionmentioning

confidence: 99%

Section: Soft Landing and Its Applications In Organometallicsmentioning

confidence: 99%

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Probing Molecular Solids with Low-Energy Ions

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Bhuin

Natarajan

et al. 2013

Annual Rev. Anal. Chem.

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“…13 The advantage of SL over other methods of preparation of materials resides in the high selectivity of the projectile ion (chemical, isotopic, structural) together with some control over the collision process through the selection of the projectile translational energy. 1,[14][15] The kind of projectile ions that have been used in SL studies include small and medium size polyatomic ions, [12][13][16][17][18][19][20][21] atomic and organometalic clusters, [22][23][24] peptides, 4 self-assembled monolayers (SAMs) of alkanethiolates on gold 38 have been the most widely used for several reasons. 1 They can be prepared with low levels of surface contamination, they are stable in ultrahigh vacuum conditions, and have a well-characterized and highly ordered structure, therefore making them excellent candidates for fundamental studies.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the Factors That Control Soft Landing of Small Silyl Ions on Fluorinated Self-Assembled Monolayers

et al. 2014

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Link to publication record in Explore Bristol Research PDF-document This is the author accepted manuscript (AAM). The final published version (version of record) is available online via ACS at http://pubs.acs.org/doi/abs/10.1021/jp501841a. Please refer to any applicable terms of use of the publisher. University of Bristol -Explore Bristol Research General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 174,. The free energy profiles for desorption of these ions show minima at 15 Å above the gold slab, indicating that the silyl ion has a preference to reside on top of the monolayer. Deep penetration of the ion into the monolayer is prevented by a large free energy barrier. However, according to DFT calculations, if this process occurred the SiNCS + ion could strongly bind to the Au(111) surface that supports the perfluorinated alkanethiol chains. 1998,

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Using Ambient Ion Beams to Write Nanostructured Patterns for Surface Enhanced Raman Spectroscopy

Baird

Bag

et al. 2014

Angewandte Chemie

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Electrolytic spray deposition was used to pattern surfaces with 2D metallic nanostructures. Spots that contain silver nanoparticles (AgNP) were created by landing solvated silver ions at desired locations using electrically floated masks to focus the metal ions to an area as little as 20 mm in diameter. The AgNPs formed are unprotected and their aggregates can be used for surface-enhanced Raman spectroscopy (SERS). The morphology and SERS activity of the NP structures were controlled by the surface coverage of landed silver ions. The NP structures created could be used as substrates onto which SERS samples were deposited or prepared directly on top of predeposited samples of interest. The evenly distributed hot spots in the micron-sized aggregates had an average SERS enhancement factor of 10 8 . The surfaces showed SERS activity when using lasers of different wavelengths (532, 633, and 785 nm) and were stable in air.Metallic nanoparticles have attractive properties in catalysis, photonics, and chemical sensing. [1] Raman spectroscopy is a powerful nondestructive technique, [2] the sensitivity of which can be significantly improved through surfaceenhanced or tip-enhanced methods. [3] The enhancement arises from the proximity of the analytes to intense localized fields created by nanoscale objects. [4] The capability to modify, coat, and pattern surfaces with nanostructures is important for SERS and also for a wider range of nanomaterials applications. [5] Conventionally, modified surfaces are constructed by delivering intact nanoparticles to target locations through dropcasting or spin coating. [6] However, the difficulty in positioning discrete particles with control over orientation, position, and degree of aggregation means that drop casting of nanoparticles has not been widely used in the highthroughput preparation of SERS substrates. Immobilized and shell-isolated nanosystems [5b, 6c, 7] address these issues, but the necessary vacuum preparation procedures significantly increase the complexity of such approaches.Ion/surface collisions including ion soft-landing have been used to fabricate surface structures under vacuum. [8] Recently an electrolytic spray ionization method [9] has been developed that is capable of generating noble metal ions directly from their solids under ambient conditions as precursors for nanoparticle synthesis. Herein, we report the in situ fabrication of SERS-active spots and micro-scale patterns by landing ionized silver at desired locations where spontaneous cathodic reduction takes place, allowing the creation of nanostructure assemblies.Silver is a widely used SERS material [10] and the plasmon resonance of silver nanostructures is tunable through the visible to mid-infrared regions of the electromagnetic spectrum. [11] Electrolytic spray deposition readily creates spots of approximately 3 mm in diameter composed of silver particles (AgNP) at desired locations, both on top of previously deposited analyte as well as prior to analyte deposition (Figure 1). Both the NP-on-top and ...

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Low-Energy Ionic Collisions at Molecular Solids

Cited by 110 publications

References 611 publications

Probing Molecular Solids with Low-Energy Ions

Probing Molecular Solids with Low-Energy Ions

Unraveling the Factors That Control Soft Landing of Small Silyl Ions on Fluorinated Self-Assembled Monolayers

Using Ambient Ion Beams to Write Nanostructured Patterns for Surface Enhanced Raman Spectroscopy

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