Ultrasensitive Ultrafast Vibrational Spectroscopy Employing the Near Field of Gold Nanoantennas

Selig, Oleg; Siffels, R.; Rezus, Y. L. A.

doi:10.1103/physrevlett.114.233004

Cited by 66 publications

(100 citation statements)

References 32 publications

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“…292,293 Surface-enhanced 2D IR has been recently demonstrated using an ATR optical geometry. 294–296 Additionally, the combination of 2D IR with plasmonic nanostructures 297,298 promises to expand the technique’s impact by probing even smaller sample volumes and opening the door to vibrational modes with weaker oscillator strengths.…”

Section: Discussionmentioning

confidence: 99%

Watching Proteins Wiggle: Mapping Structures with Two-Dimensional Infrared Spectroscopy

2017

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Proteins exhibit structural fluctuations over decades of time scales. From the picosecond side chain motions to aggregates that form over the course of minutes, characterizing protein structure over these vast lengths of time is important to understanding their function. In the past 15 years, two-dimensional infrared spectroscopy (2D IR) has been established as a versatile tool that can uniquely probe proteins structures on many time scales. In this review, we present some of the basic principles behind 2D IR and show how they have, and can, impact the field of protein biophysics. We highlight experiments in which 2D IR spectroscopy has provided structural and dynamical data that would be difficult to obtain with more standard structural biology techniques. We also highlight technological developments in 2D IR that continue to expand the scope of scientific problems that can be accessed in the biomedical sciences.

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Section: Discussionmentioning

confidence: 99%

Watching Proteins Wiggle: Mapping Structures with Two-Dimensional Infrared Spectroscopy

2017

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“…(at%), it should be the mixture phase of AuSn 4 and Ag 3 Sn. The bottom zone was the Sn-based solder zone, some long columnar Au-Sn IMCs appeared in this zone.…”

Section: Chemical Composition and Micro-hardness Of Imcs Layermentioning

confidence: 99%

“…Gold and its alloy have many unique advantages, such as high ductility, resistance to corrosion, oxidation and most other chemical reactions, and good conductivity of heat and electricity etc [1]. Its good conductivity and general resistance to oxidation and corrosion in other environments make it undisputed material of choice to guarantee reliability in a broad range of highperformance and safety-critical applications in corrosion resistant electrical connectors in all types of computerized devices, especially in electronic sliding contacts in highly humid or corrosive atmospheres, and in use for contacts with a very high failure cost (certain computers, communications equipment, spacecraft, and jet aircraft engines) [2,3,4]. Additions of silver and copper into gold will improve the electrical conductivity of pure gold based on maintaining its excellent chemical stability, enhance its hardness, strength and abrasive resistance, and decrease the temperature-resistance coefficient and thermoelectric potential to copper [5].…”

Section: Introductionmentioning

confidence: 99%

Influence of Thermal Aging on Microstructure and Property of Gold Alloy Joint Soldered by Sn-based Solder

et al. 2019

MATEC Web Conf.

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As an undisputed material of choice to guarantee reliability in a broad range of high performance and safety-critical applications in the electrical contacts and connectors, AuAgCu alloy was soldered with Ag-plated Cu wire using Sn-based solder. To clarify the embrittlement and strength reduction of the gold soldered joint, the microstructure and its influence on the macroand micro-mechanical properties of the soldered joint under various thermal aging conditions were studied. The result indicated that, taking the mechanical property consideration alone, Sn-based solder could be used to join AuAgCu alloy. Different from the embrittlement and strength reduction of the soldered joint of pure gold, although the brittle fracture features appeared in mechanical test of the soldered joints, the shear strength of soldered joint after thermal aging at 125 °C almost did not decrease in comparison with that before thermal aging. Nevertheless, too high temperature and long time still had bad influence on mechanical properties. Otherwise, thermal aging had a large effect on the IMCs layer, as aging temperature elevated and aging time increased, IMCs layer became thicker, more complex components and multiply-sublayers structure with different microhardness. The study provides a fundamental understanding for gold alloy soldering.

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“…They deposited a monolayer onto the attenuated total reflection cell and used an azide reporter group. Rezus and coworkers enhanced 2D IR surface signals using mid-IR plasmons (17). Of all of these, Yan et al's (3) implementation is the most elegant and straightforward to employ.…”

Section: Methods and Applications Of 2d Ir With Monolayer Sensitivitymentioning

confidence: 99%

Two-dimensional infrared spectroscopy measures the structural dynamics of a self-assembled film only one molecule thick

Zanni

2016

Proc. Natl. Acad. Sci. U.S.A.

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Since its first demonstration, many comparisons have been made between 2D infrared (2D IR) and NMR spectroscopy (1, 2). Both techniques use a series of pulses to manipulate and measure free induction decays that resolve couplings and dynamics through their characteristic multidimensional plots. The timescales are very different, with 2D IR spectroscopy using femtosecond pulses to measure the picosecond coherence times of vibrational modes, whereas NMR spectroscopy uses microsecond or millisecond pulses to measure nuclear spins that can last seconds. Thus, the two spectroscopies provide vastly different perspectives on structural dynamics. The article by Yan et al. (3), published in PNAS, uses the fast time resolution of 2D IR spectroscopy to study the structural dynamics of a functionalized self-assembled monolayer, providing insights into structural motions that are intimately related to chemistry. However, their experiments are also demonstrating an aspect of the technique that is only now being recognized as exceptional: the sensitivity of the technique to incredibly small amounts of material.NMR spectroscopy is often said to be insensitive (4). Although the level of sensitivity depends on many factors, such as the type of nuclei being measured and the magnetic field strength of the spectrometer, the statement itself refers to the differences in population between the nuclear spin states that create the free induction decays, given by the Boltzman distribution. At room temperature, the energy difference between nuclear spin states is much smaller than kT, resulting in nearly equal populations of states. The difference in population between two 1 H proton states in an 11.7-Tesla magnetic field is about 1 in 10 5 (4). In comparison, the energy difference between the υ = 0 and υ = 1 vibrational states is about eight-times larger than kT, resulting in an enormous difference in population between the states. In other words, vibrational states have almost the entire population in the ground state.Signal strength, and hence the sensitivity, are related to population differences because free induction decays are generated by unequal numbers of transitions between eigenstates (5). An ensemble of molecules with statistically equally populated eigenstates will produce no signal because there are as many absorption as emission transitions. (In fact, a commonly used trick in NMR is to purposely equilibrate eigenstates to eliminate unwanted signals.) Thus, the ultimate sensitivity of 2D IR spectroscopy is inherently much higher than NMR spectroscopy, because nearly all of the molecules in the ensemble are available for excitation. Dynamics of a Self-Assembled Film only One Molecule ThickIn their article, Yan et al. (3) demonstrate and use the sensitivity of 2D IR spectroscopy to measure a monolayer of molecules on a surface. The authors tethered a rhenium carbonyl vibrational probe to a monolayer of undecanethiol alkyl chains. Vibrational modes are sensitive to hydrogen bonding and electrostatics, and so the frequencies of...

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Ultrasensitive Ultrafast Vibrational Spectroscopy Employing the Near Field of Gold Nanoantennas

Cited by 66 publications

References 32 publications

Watching Proteins Wiggle: Mapping Structures with Two-Dimensional Infrared Spectroscopy

Watching Proteins Wiggle: Mapping Structures with Two-Dimensional Infrared Spectroscopy

Influence of Thermal Aging on Microstructure and Property of Gold Alloy Joint Soldered by Sn-based Solder

Two-dimensional infrared spectroscopy measures the structural dynamics of a self-assembled film only one molecule thick

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