Results 161 to 170 of about 606 (208)

Second‐Harmonic Hyper‐Mie Optical Activity Enables Closed‐Loop Chiral Photochemistry

Advanced Materials, EarlyView.
Nonlinear chiral photochemistry is demonstrated in CdTe/CdO nanohelices, where circularly polarized infrared light both drives and tracks photo‐oxidation via second‐harmonic scattering. This closed‐loop process reveals real‐time structural evolution, including shell fracturing and core exposure, accompanied by a transition from hyper‐Mie to hyper ...
Hoyeon Choi, Kody Whisnant, Ben J. Olohan, E. Petronijevic, G. Dan Pantoș, Nicholas A. Kotov, Ventsislav K. Valev   +6 more
wiley   +1 more source

Ratiometric Mycotoxin Detection in Living Plants With Dual‐Emissive Nanosensors

Advanced Materials, EarlyView.
A minimally invasive microneedle patch integrates carbon dot‐embedded metal–organic frameworks as nanosensors to detect a key fungal toxin in living plants. The nanosensor produces a ratiometric fluorescence signal that enables early, non‐destructive diagnosis of fungal infection before visible symptoms, offering a new biomaterials‐based strategy for ...
Yuliang Li, Di Shen, Ziyang Huang, Suppanat Puangpathumanond, Calvin Thenarianto, Yue Zhao, Jolly Madathiparambil Saju, Rajani Sarojam, Dongmei Zhou, Tedrick Thomas Salim Lew   +9 more
wiley   +1 more source

Tailoring Phonon‐Driven Responses in α‐MoO3 through Isotopic Enrichment

Advanced Materials, EarlyView.
ABSTRACT The implementation of polaritonic materials into nanoscale devices requires selective tuning of parameters to realize desired spectral or thermal responses. One robust material, α‐MoO3, an orthorhombic crystal boasting three distinct phonon dispersions, provides three polaritonic dispersions of hyperbolic phonon polaritons (HPhPs) across the ...
Thiago S. Arnaud, Ryan W. Spangler, Johnathan D. Georgaras, Jonah B. Haber, Daniel Hirt, Maximilian Obst, Gonzalo Álvarez‐Pérez, Mackey Long III, Felix G. Kaps, Jakob Wetzel, Courtney Ragle, John E. Buchner, Youngji Kim, Aditha S. Senarath, Richarda Niemann, Mingze He, Giulia Carini, Unai Arregui‐Leon, Akash C. Behera, Ramachandra Bangari, Nihar Sahoo, Niels C. Brumby, J. Michael Klopf, Martin Wolf, Lukas M. Eng, Susanne C. Kehr, Thomas G. Folland, Alexander Paarmann, Patrick E. Hopkins, Felipe Jornada, Jon‐Paul Maria, Joshua D. Caldwell   +31 more
wiley   +1 more source

Co1/Ru Single‐Atom Alloy Catalyst for Sustainable Polypropylene Hydrogenolysis to Long‐Chain Liquid Products

Advanced Materials, EarlyView.
A titania‐supported Co1/Ru single‐atom alloy catalyst enables efficient polypropylene hydrogenolysis. Ru─Co─Ru motifs maintain Ru activity while suppressing excessive chain scission to gaseous products. Both virgin and waste plastics achieve high, environmentally and economically optimal C11+ liquid yields, supporting sustainable chemical recycling ...
Yuzhen Ge, Yimeng Jin, Alexandra Krestnikova, Sibei Zou, Antonio J. Martín, Gonzalo Guillén‐Gosálbez, Javier Pérez‐Ramírez   +6 more
wiley   +1 more source

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Gold nanonails for surface-enhanced infrared absorption

Nanoscale Horizons, 2020
Colloidal gold nanonails, exhibiting large electric field enhancement in the mid-infrared region, are synthesized for surface-enhanced infrared absorption (SEIRA).
Hang Yin, Nannan Li, Yubing Si, Han Zhang, Baocheng Yang, Jianfang Wang   +5 more
openaire   +2 more sources

Ellipsometric studies related to surface-enhanced infrared absorption

Talanta, 2000
Infrared ellipsometry has been applied to determine the refractive index n and the absorption index k as well as the thickness of metal island films causing surface enhanced infrared absorption (SEIRA). The results from numerous films prepared in several campaigns are presented. For films of a nominal thickness of 6 nm, k is found to range from 0 to 3,
E H Korte, A Röseler
exaly   +3 more sources

Classical Model of Surface Enhanced Infrared Absorption (SEIRA) Spectroscopy

The Journal of Physical Chemistry A, 2022
The molecule-plasmon interaction is the key to the mechanisms of surface enhanced infrared absorption (SEIRA) and surface enhanced Raman scattering (SERS). Since plasmons are well described by Maxwell's equations, one fundamental treatment involves the classical interpretation of infrared absorption and resonance Raman spectroscopies. We can understand
Yuan Gao, D. E. Aspnes, Stefan Franzen
openaire   +2 more sources

Surface-enhanced infrared absorption?

Surface Science, 1999
In ultra-high vacuum (UHV) we have measured infrared transmission spectra of CO on ultra-thin films of iron grown at about 315 K on UHV-cleaved MgO(001). Even at normal incidence of light we observe several asymmetric CO stretching lines with positions, intensities and shapes dependent on film morphology.
Oliver Krauth, Gerhard Fahsold, Annemarie Lehmann   +2 more
openaire   +1 more source

Surface-Enhanced Infrared Absorption Spectroscopy

2018
Surface-enhanced infrared absorption (SEIRA) is an effect in which infrared absorption of molecules adsorbed on metal surfaces is significantly enhanced (10–1000 times compared to normal measurements without the metal) and has characteristic features as follows:(Osawa in Dynamic processes in electrochemical reactions studied by surface-enhanced ...
Domke, K., Zhumaev, U.
openaire   +3 more sources

Surface Enhanced Infrared Absorption by Nanoparticles

Frontiers in Optics, 2005
We study surface enhanced infrared absorption, including multiphoton processes, due to the excitation of surface plasmons on metal nanoparticles. The time-dependent Schrodinger equation and finite-difference time-domain method are self-consistently coupled to treat the problem.
Shih-Hui Chang, George C. Schatz, Stephen K. Gray   +2 more
openaire   +1 more source