Total internal reflection sum-frequency generation spectroscopy and dense gold nanoparticles monolayer: a route for probing adsorbed molecules

Tourillon, G.; Dreesen, Laurent; Volcke, Cédric; Sartenaer, Yannick; Thiry, P.A.; Péremans, A.

doi:10.1088/0957-4484/18/41/415301

Cited by 40 publications

(68 citation statements)

References 48 publications

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“…Therefore, the main advantage of this technique for nanotechnological devices characterization lies in its interface intrinsic molecular sensitivity at the sub-monolayer level and its potential coupling to the SPR resonance as recently demonstrated by considering samples based on solid substrate as platforms for nanosensors, an amplification factor of the molecular SFG signal was put in evidence for functionalized AuNps films with respect to a flat gold reference surface. AuNps were deposited either on silicon in external reflection configuration [4] or on glass substrates in total internal reflection configuration [5] to compare the sensitivity and molecular ordering of functionalized AuNp films as a function of the surface coverage on glass [6], to unravel the orientation of grafted molecules on AuNps and AgNps [7] and to extract and deduce the nature of the vibration modes thanks to the SPR amplification on functionalized AuNp films in the fingerprint spectral range of aromatic molecules with density functional theory (DFT) calculations [8]. In a general way, SFG has also proven its efficiency in biomolecular recognition on glass substrate [9], in DNAbased biosensors on Pt(111) single crystal [10] and in enlightening DNA hybridization on glass [11] and (100)-facetted gold films [12].…”

Section: Introductionmentioning

confidence: 99%

Optical spectroscopy of functionalized gold nanoparticles assemblies as a function of the surface coverage

et al. 2013

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Layers of thiophenol functionalized spherical gold nanoparticles grafted on Si(100) are probed by linear UV-vis, Fourier transform infrared and nonlinear infrared-visible vibrational sum/difference-frequency generation spectroscopies as a function of the nanoparticles surface coverage. Depending on the dipping time (5 min, 20 min, 1 h, and 24 h) in the colloidal solution, AFM imaging corroborates that the silicon surface coverage with gold nanoparticles increases, while the distance between neighbouring nanoparticles decreases, leading to their aggregation which dramatically impacts their optical properties. In the UV-vis reflectance spectra after the appearance of the 525-nm individual plasmonic band, a second broad band located at 660 nm and related to the gold nanoparticles aggregation on silicon rapidly dominates in intensity. Nonlinear vibrational spectroscopy is able to detect the specific vibration of the thiophenol molecules (3, 055 cm −1 ) whatever the immersion time and at least down to 1 % of the substrate filling factor by the gold nanoparticles, overtaking the molecular sensitivity threshold of surface infrared and Raman spectroscopies on small gold nanostructures (17 nm) adsorbed on a semiconductor. Moreover, a quantitative analysis of the nonlinear vibrational fingerprint from 5 min to 24 h in the framework of the effective medium models of Maxwell-Garnett and Bruggeman illustrates the role played by the interband and the plasmonic properties of gold modulated by the silicon optical response. In this case, the sample reflectivity affects the molecular oscillator strength measured by nonlinear optical vibrational spectroscopy. For this latter technique, no coupling with the optical properties of aggregated AuNps is evidenced while the localized surface plasmon resonance excitation amplifies the molecular response.

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Section: Introductionmentioning

confidence: 99%

Optical spectroscopy of functionalized gold nanoparticles assemblies as a function of the surface coverage

et al. 2013

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“…37,38,55,[79][80][81] The small methylene SFG intensities observed for duration over 200 ms suggest a chain structure close to the crystallike centrosymmetric one. However, degradations (and disorder) in the alkyl chain conformation occur for a printing duration smaller than 200 ms.…”

Section: Resultsmentioning

confidence: 99%

Self-Assembled Film Organization in Fast Microcontact Printing Investigated by Sum Frequency Generation Spectroscopy

et al. 2009

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The ability of microcontact printing to build highly ordered alkanethiol self-assembled monolayers (SAMs) on Pt substrates within a short time is studied by sum frequency generation (SFG) spectroscopy and contact angle measurements. The deposition of ordered hexadecanethiol and dodecanethiol monolayers onto platinum substrates is achieved in less than 1 s. The film order and the alkane chain orientation are deduced from the SFG fingerprint acquired under different sets of laser polarization. Comparisons between the SAMs prepared by printing or by immersion demonstrate that both methods lead to the same high quality organization. Patterning effects within printed films are also investigated with respect to the layer conformation. Finally, wetting properties of printed layers are correlated with the printing duration, corroborating the spectroscopic results.

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“…However, these techniques cannot simultaneously fulfill the need to selectively monitor the molecular details of the surface and interface and avoid the interference of the information from species in the bulk. Specifically, although FT-IRRAS and SERS have the capability to probe surface chemistry with molecular resolution, FT-IRRAS generally requires a reference spectrum in order to sort out the interfacial signal and SERS needs specially prepared metal surfaces or the use of nanoparticles of the order of several nanometers to 100 nm for electromagnetic and/or chemical enhancement [159]. One surface-specific technique that has been proven to yield molecular level structure information (e.g.…”

Section: Sfg Vibrational Spectroscopymentioning

confidence: 99%

“…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%

“…This approach represents a new platform with potential use in biosensors, diagnostics and bioactive layers. Moreover, the combination of SFG and a similarly prepared AuNP film can be used to probe adsorbed molecules [159,204]. Tourillon et al [159] showed that when SFG is performed in a total internal reflection configuration combined with a dense AuNP monolayer, the conformation of adsorbed molecules can be studied with an excellent signal to noise ratio and high signal to background ratio.…”

Section: Sfg Studies At the Nano-bio Interfacementioning

confidence: 99%

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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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Total internal reflection sum-frequency generation spectroscopy and dense gold nanoparticles monolayer: a route for probing adsorbed molecules

Cited by 40 publications

References 48 publications

Optical spectroscopy of functionalized gold nanoparticles assemblies as a function of the surface coverage

Optical spectroscopy of functionalized gold nanoparticles assemblies as a function of the surface coverage

Self-Assembled Film Organization in Fast Microcontact Printing Investigated by Sum Frequency Generation Spectroscopy

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

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