Effect of Nanoscale Geometry on Molecular Conformation:  Vibrational Sum-Frequency Generation of Alkanethiols on Gold Nanoparticles

Weeraman, Champika; Yatawara, Achani K.; Bordenyuk, and Andrey N.; Benderskii, Alexander V.

doi:10.1021/ja065756y

Cited by 140 publications

(228 citation statements)

References 12 publications

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“…These results can be explained as that the decreasing the curvature of the AuNP (i.e., larger AuNPs) resulted in decreasing the conical volume available for the alkyl chain on the surface of the AuNP (Fig. 2(d)inset) as mentioned by other reports 25,26 . Accordingly, decreasing the interspace of ODT molecules promoted the SAM formation on the surface of AuNP.…”

Section: Resultssupporting

confidence: 64%

“…Accordingly, the results of FT-IR and Raman spectroscopy show that the ratio of the gauche conformation depends on the size of AuNP in formation process of SAM. Further, the defects decreased with increasing the curvature, that is, increasing the conical volume available for the alkyl chain 25,26 . Thus, the increased space in the SAM is favorable to form gauche conformation.…”

Section: Resultsmentioning

confidence: 97%

“…Although the adsorbed structures of alkanethiols have been reported to be affected by alkyl chain length and particle diameter [23][24][25][26][27][28] , the formation process of the SAMs on the surfaces of AuNPs have not yet been studied systematically.…”

Section: Introductionmentioning

confidence: 99%

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Vibrational Spectroscopic Studies on the Formation Processes and Characteristics of Octadecanethiol Monolayers on the Surfaces of Gold Nanoparticles

Ishida

Tachikiri

Takahashi

et al. 2015

Trans. Mat. Res. Soc. Japan

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The preparation method of hydrophobic gold nanoparticles (AuNPs) with the diameters of 17, 30 and 48 nm has been developed. So as to clarify the size effects of AuNPs on the hydrophobization processes, time courses for the formation of the self-assembled monolayers (SAMs) of octadecanethiol (ODT) molecules on the surfaces of the AuNPs have been investigated by means of FT-IR and Raman spectroscopies. In all cases, the alkyl chains were mainly arranged as all-trans conformation (solid-like) at the completion of the reaction. Observation of the time course of ODT-SAM formation revealed that smaller curvature (larger size) resulted in the faster formation of SAM because of smaller conical volume snugly available for the alkyl chain on the surface of the AuNP.

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Section: Resultssupporting

confidence: 64%

Section: Resultsmentioning

confidence: 97%

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Vibrational Spectroscopic Studies on the Formation Processes and Characteristics of Octadecanethiol Monolayers on the Surfaces of Gold Nanoparticles

Ishida

Tachikiri

Takahashi

et al. 2015

Trans. Mat. Res. Soc. Japan

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“…At the interface between two such environments, symmetry is broken, molecules may have a net orientation, and nonlinear optical signals can be generated. The distribution of molecular orientations of a given set of oscillators, for example those at the SOA particle surface, can be readily determined using SFG (Esenturk et al, 2004b;Wang et al, 2005;Weeraman et al, 2006;Chen et al, 2007;Tyrode et al, 2008). Achiral molecules in centrosymmetric environments, be they liquid or solid, do not contribute to the SFG response.…”

Section: Sfg Theorymentioning

confidence: 99%

Contrasting organic aerosol particles from boreal and tropical forests during HUMPPA-COPEC-2010 and AMAZE-08 using coherent vibrational spectroscopy

et al. 2011

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Abstract. We present the vibrational sum frequency generation spectra of organic particles collected in a boreal forest in Finland and a tropical forest in Brazil. These spectra are compared to those of secondary organic material produced in the Harvard Environmental Chamber. By comparing coherent vibrational spectra of a variety of terpene and olefin reference compounds, along with the secondary organic material synthesized in the environmental chamber, we show that submicron aerosol particles sampled in Southern Finland during HUMPPA-COPEC-2010 are composed to a large degree of material similar in chemical composition to synthetic α-pinene-derived material. For material collected in Brazil as part of AMAZE-08, the organic component is found to be chemically complex in the coarse mode but highly uniform in the fine mode. When combined with histogram analyses of the isoprene and monoterpene abundance recorded during the HUMPPA-COPEC-2010 and AMAZE-08 campaigns, the findings presented here indicate that if air is rich in monoterpenes, submicron-sized secondary aerosol particles that form under normal OH and O 3 concentration levels can be described in terms of their hydrocarbon content as being similar to α-pinene-derived model secondary orCorrespondence to: F. M. Geiger (geigerf@chem.northwestern.edu) ganic aerosol particles. If the isoprene concentration dominates the chemical composition of organic compounds in forest air, then the hydrocarbon component of secondary organic material in the submicron size range is not simply wellrepresented by that of isoprene-derived model secondary organic aerosol particles but is more complex. Throughout the climate-relevant size range of the fine mode, however, we find that the chemical composition of the secondary organic particle material from such air is invariant with size, suggesting that the particle growth does not change the chemical composition of the hydrocarbon component of the particles in a significant way.

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“…Recent studies have demonstrated that SFG is a powerful and information-rich probe of nanostructured surfaces [193][194][195], and surface behaviors with nanoparticles [159,[196][197][198][199][200]. In the following sections, recent advancements that explore the utility of SFG as a powerful and unique technique to study surfaces/interfaces containing nanoparticles will be covered.…”

Section: Sfg Studies At the Nano-bio Interfacementioning

confidence: 99%

Nano-bio interfaces probed by advanced optical spectroscopy: From model system studies to optical biosensors

Zhang

Han

et al. 2013

Chin. Sci. Bull.

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Research in biology and medicine is a rapidly expanding field incorporating some of the most fundamental questions concerning structure, function, and purpose. The forefront of new research demands access to advanced techniques and instrumentation capable of probing these unanswered questions. Over the past several decades, nano-scale materials and devices ranging from quasione dimensional quantum dots to two dimensional graphene sheets have been engineered and have found applications in nano-bio imaging and spectroscopy. In this review, the incorporation of nanomaterials into three influential spectroscopic and microscopic techniques including fluorescence microscopy, surface plasmon resonance, and sum frequency generation will be introduced. Fluorescence imaging has visualized nanomaterials as compliments or replacements to comparable organic fluorphores, act as a quencher for FRET-based sensing, and serve as a nanoscaffold for molecular beacons. Their versatility in coating materials makes nanomaterials an excellent targeting molecule for any cellular macromolecule or structure. In addition to the targeting capabilities of nanomaterials in fluorescence imaging, surface plasmon resonance has incorporated nanomaterials for applications in signal enhancement, selectivity of target molecules, and the development of more refined and accurate detection. Functionalized nanoparticles enhance the capabilities of sum frequency generation vibrational spectroscopy by providing unique surface chemistry which alters target molecule interactions and orientations. In summary, the incorporation of nanomaterials has greatly enhanced the field of biology and medicine and has allowed for the continual advancement of not only research but instrument development. nano-bio interfaces, optical spectroscopy, fluoroscence, SERS, SFG Citation:Zhang X X, Han X F, Wu F G, et al. Nano-bio interfaces probed by advanced optical spectroscopy: From model system studies to optical biosensors. Chin Sci Bull, 2013, 58: 25372556, doi: 10.1007/s11434-013-5700-y Nanomaterials, which size ranges (1-100 nm) coincide with fundamentally important length scales in physics, are considered to be promising building blocks for future electrical, optical and optoelectronic applications [1][2][3][4][5][6][7][8]. For example, in metals, the mean free path of an electron at room temperature is ~10-100 nm [9]; the Bohr radius of photo-excited electron-hole pairs in semiconductors is ~1-10 nm [10]; and the 1-100 nm dimension is the range over which molecules assemble into nucleic acids and proteins [11]. Nanostructures on this size scale provide a unique technology to determine many critical structure/function relationships of biological molecules at the cellular level without introducing substantial interference. Advances in nanotechnology have developed at several stages: materials, devices, and systems. A decade ago, extensive research has focused on the development of various methods to precisely control the synthesis of nanomaterials. Therefore, many differ...

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Effect of Nanoscale Geometry on Molecular Conformation: Vibrational Sum-Frequency Generation of Alkanethiols on Gold Nanoparticles

Cited by 140 publications

References 12 publications

Vibrational Spectroscopic Studies on the Formation Processes and Characteristics of Octadecanethiol Monolayers on the Surfaces of Gold Nanoparticles

Vibrational Spectroscopic Studies on the Formation Processes and Characteristics of Octadecanethiol Monolayers on the Surfaces of Gold Nanoparticles

Contrasting organic aerosol particles from boreal and tropical forests during HUMPPA-COPEC-2010 and AMAZE-08 using coherent vibrational spectroscopy

Nano-bio interfaces probed by advanced optical spectroscopy: From model system studies to optical biosensors

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