Nanogapped Au Antennas for Ultrasensitive Surface-Enhanced Infrared Absorption Spectroscopy

Dong, Liangliang; Yang, Xiao; Zhang, Chao; Cerjan, Benjamin; Zhou, Linan; Tseng, Ming Lun; Zhang, Yu; Alabastri, Alessandro; Nordlander, Peter; Halas, Naomi J.

doi:10.1021/acs.nanolett.7b02736

Cited by 211 publications

(199 citation statements)

References 50 publications

Supporting

Mentioning

189

Contrasting

Unclassified

Order By: Relevance

“…Besides SERS, plasmonic metal nanogaps have also been employed in SERIA spectroscopy . As presented in Figure c, Dong et al produced a bowtie‐shaped Au structure with a sub‐3 nm gap for SERIA spectroscopy to quantitatively analyze chemical components . The percentages of mixed 4‐nitrothiophenol (4‐NTP) and 4‐methoxythiolphenol (4‐MTP) composites were successfully identified.…”

Section: Device Applicationsmentioning

confidence: 99%

See 1 more Smart Citation

Sub‐5 nm Metal Nanogaps: Physical Properties, Fabrication Methods, and Device Applications

Yang

2018

Small

View full text Add to dashboard Cite

Sub‐5 nm metal nanogaps have attracted widespread attention in physics, chemistry, material sciences, and biology due to their physical properties, including great plasmon‐enhanced effects in light–matter interactions and charge tunneling, Coulomb blockade, and the Kondo effect under an electrical stimulus. These properties especially meet the needs of many cutting‐edge devices, such as sensing, optical, molecular, and electronic devices. However, fabricating sub‐5 nm nanogaps is still challenging at the present, and scaled and reliable fabrication, improved addressability, and multifunction integration are desired for further applications in commercial devices. The aim of this work is to provide a comprehensive overview of sub‐5 nm nanogaps and to present recent advancements in metal nanogaps, including their physical properties, fabrication methods, and device applications, with the ultimate aim to further inspire scientists and engineers in their research.

show abstract

Section: Device Applicationsmentioning

confidence: 99%

“…Number of 4‐NTP (blue) and 4‐MTP (red) molecules on the Au surface in a 3 nm gap after functionalization in mixed solutions of various molar percentages. Reproduced with permission . Copyright 2017, American Chemical Society.…”

Section: Device Applicationsmentioning

confidence: 99%

Sub‐5 nm Metal Nanogaps: Physical Properties, Fabrication Methods, and Device Applications

Yang

2018

Small

View full text Add to dashboard Cite

show abstract

“…Therefore, quantifying the concentration of chemicals is also workable using surface enhanced spectroscopy. The detection limit of molecule concentration is shown to be as low as sub‐ppm level by the nanogap enhanced near‐field …”

Section: Metamaterials In Chemical Sensing Applicationsmentioning

confidence: 99%

“…Many fundamental works have been done to improve the sensitivity of plasmonic sensors. One approach is to increase the near‐field intensity by shrinking the gap between adjacent plasmonic nanoantennas to the nanometer scale, the other way is to expose the hotspot area for the access of molecules which is blocked by the substrate . However, there is a tradeoff between near‐field intensity and hotspot area in planar metamaterial resonators.…”

Section: Metamaterials In Chemical Sensing Applicationsmentioning

confidence: 99%

Leveraging of MEMS Technologies for Optical Metamaterials Applications

Ren

Chang

et al. 2019

Advanced Optical Materials

167

View full text Add to dashboard Cite

Tunable metamaterial devices have experienced explosive growth in the past decades, driving the traditional electromagnetic (EM) devices to evolve into diversified functionalities by manipulating EM properties such as amplitude, frequency, phase, polarization, and propagation direction. However, one of the bottlenecks of these rapidly developed metamaterials technologies is limited tunability caused by the intrinsic frequency‐dependent property of exotic tunable material. To overcome such limitation, the microelectromechanical system (MEMS) enabling micro/nanoscale manipulation is developed to actively control “meta‐atom” in terahertz and infrared region, which brings frequency‐scalable tunability and complementary metal‐oxide‐semiconductor‐compatible functional meta‐devices. Beyond tunability, novel chemical sensing platforms of molecular identification and dynamic monitoring of the biochemical process can be achieved by integrating micro/nanofluidics channels with metamaterial resonators. Additionally, incorporating metamaterial absorbers with MEMS resonators brings another research interest in MEMS zero‐power devices and radiation sensors. Furthermore, moving from 2D metasurfaces to 3D metamaterials, enhanced EM properties like novel resonance mode, giant chirality, and 3D manipulation reinforce the application in biochemical and physical sensors as well as functional meta‐devices, paving the way to realize multi‐functional sensing and signal processing on a hybrid smart‐sensor microsystem for booming healthcare, environmental monitoring, and the Internet of Things applications.

show abstract

“…The most promising approach regarding single-molecule detection is given by coupled nanostructures, which are separated by a nanometer-sized gap [10,15,16]. Recently, Dong et al [17] have made an important step toward single-molecule SEIRA detection by showing that as few as 500 molecules can be detected by using bowtie-shaped Au structures with a sub-3-nm gap into which the near field is confined.…”

Section: Introductionmentioning

confidence: 99%

Chemical Identification of Single Ultrafine Particles Using Surface-Enhanced Infrared Absorption

et al. 2019

View full text Add to dashboard Cite

In the past decade, it has been demonstrated that surface-enhanced infrared absorption (SEIRA) is a powerful method to enhance vibrational signals of thin molecular layers. Much less attention has so far been given to the possibility of using SEIRA for the detection and characterization of nanometer-sized particles, such as ultrafine dust particles. Here, we report on SEIRA measurements demonstrating that even one single particle with a deeply subwavelength dimension of less than 100 nm can be detected and chemically characterized with standard infrared microspectroscopy. Our approach is based on plasmonic resonances of bowtie-shaped Au apertures that are designed to extraordinarily enhance the materialspecific phononic excitations of a nanometer-sized silica particle. We show that the bowtie geometry is especially suited for single-particle spectroscopy, as it combines the advantage of an intense electromagnetic hot spot, the size of which can be adjusted to the particle dimension, with easy positioning of ultrafine dust particles inside that hot spot. In agreement with numerical calculations, we show that a detection limit in terms of a particle diameter of less than 20 nm can be achieved, which corresponds to a ratio of the diameter to the vacuum wavelength below 0.002. Our approach offers the possibility of analyzing infrared bands from tiniest particles and thus paves the way toward SEIRA-based devices that can sense ultrafine dust.

show abstract

Nanogapped Au Antennas for Ultrasensitive Surface-Enhanced Infrared Absorption Spectroscopy

Cited by 211 publications

References 50 publications

Sub‐5 nm Metal Nanogaps: Physical Properties, Fabrication Methods, and Device Applications

Sub‐5 nm Metal Nanogaps: Physical Properties, Fabrication Methods, and Device Applications

Leveraging of MEMS Technologies for Optical Metamaterials Applications

Chemical Identification of Single Ultrafine Particles Using Surface-Enhanced Infrared Absorption

Contact Info

Product

Resources

About