Article
Chemistry, Physical
Cristian Zagar, Ferdinand G. P. Krammer, John B. Pendry, Alexei A. Kornyshev
Summary: Recent experimental studies have investigated the optical effects of adsorbed arrays of gold nanoparticles on reflective substrates and transparent interfaces. The results showed a quenching effect on reflective substrates and an enhancement effect on transparent interfaces. This paper presents a theoretical analysis of the optical response of nanoparticle arrays on stacked nanosheet hyperbolic substrates, and investigates the effect of array density on the optical response.
NANOSCALE HORIZONS
(2022)
Article
Chemistry, Multidisciplinary
Xingyue Lin, Yuhan Zhou, Xinyang Pan, Qin Zhang, Ningneng Hu, Hao Li, Le Wang, Qi Xue, Wei Zhang, Weihai Ni
Summary: We demonstrate trace detection of chiral J-aggregated molecules adsorbed on individual Au nanorods using single-particle circular differential scattering (CDS) spectroscopy. Plasmonic nanocrystals can dramatically amplify the circular dichroism of strongly coupled molecules to a detectable level, with a significant amplification factor of 10(8). Our method provides a promising strategy for the trace detection of chiral molecules using optical microscopic methods.
Article
Multidisciplinary Sciences
Jiri Dolezal, Sofia Canola, Prokop Hapala, Rodrigo Cezar de Campos Ferreira, Pablo Merino, Martin Svec
Summary: The authors observed the coupling between librational states and charged excited states in a phthalocyanine molecule absorbed on a surface. They provided a detailed analysis of the coupling and successfully simulated the spectral features. This research showcases the potential of using low-energy molecular modes to characterize molecular dynamics.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Alexander C. Brannan, Hwan-Hee Cho, Antti-Pekka M. Reponen, Mikko Linnolahti, Manfred Bochmann, Neil C. Greenham, Alexander S. Romanov
Summary: A series of carbene-gold-acetylide complexes have been synthesized and found to exhibit deep-blue to blue-green phosphorescence in various media. The increase of carbene-gold moieties in these complexes leads to higher extinction coefficients and stronger oscillator strength coefficients in the UV-vis spectra.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
J. R. Chen, D. C. Wang, D. S. Ren, M. Lu, M. J. Peng
Summary: By introducing silver nanoparticles to generate surface plasmons in Si-nc LED and utilizing black silicon to enhance the charge injection efficiency and light emission efficiency, the electroluminescence intensity of Si-nc was significantly increased.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Physical
Xiaoqi Tang, Siyu He, Yunzhou Deng, Xiuyuan Lu, Xitong Zhu, Wangxiao Jin, Yizheng Jin
Summary: Quantum-dot light-emitting diodes (QLEDs) have potential for next-generation display and lighting technologies. A new method of in situ diffusion of magnesium atoms into the ZnO-based electron-transport layers (ETLs) improves the conductivities and luminous efficiencies of QLEDs without sacrificing their quantum efficiencies. This approach can also be applied to other solution-processed LEDs using ZnO-based ETLs.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Vijay Laxmi, Weilong Dong, Haoqiang Wang, Dianyu Qi, Qiaoyan Hao, Zhengbiao Ouyang, Waqas Ahmad, Muhammad Najeeb Ullah Shah, Qunhui Yuan, Wenjing Zhang
Summary: This study utilized graphene quantum dots as a protective layer on the surface of black phosphorus to prevent degradation under oxygen and humidity conditions. The optimized field-effect transistors showed enhanced stability and electrical performance, even maintaining their characteristics for an extended period under high temperatures.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Ghassem Baridi, Shiravan Gharaaty, Yaser Hajati, Mohammad Sabaeian
Summary: Recent research has shown that the graphene plasmonic effect can enhance the optical properties of quantum dots through the Purcell's effect. By using a fewer number of graphene layers and a simpler scheme, comparable results in transition dipole moments and optical properties are achieved.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Filipe B. Magalhaes, Ruth F. V. V. Jaimes, Paola Corio, Walter J. Salcedo
Summary: By manufacturing Au nanocylinder arrays with a monolayer of nicotinamide adenine dinucleotide (NAD), intense and fluctuating Raman lines were observed in surface-enhanced Raman scattering (SERS) measurements, suggesting a dynamic back-action parametric interaction between plasmon mode and vibrational modes. The study indicates that the highly efficient SERS structure promotes the formation and destruction of protuberances smaller than 2 nm on the nanocylinder surface.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Optics
T. Mahata, A. Mandal, V. R. Dantham
Summary: Theoretical simulations were conducted on the NEF and FFS properties of gold-silver alloy nanospheres and nanoshells, focusing on the role of size-dependent damping and alloy composition. The study also analyzed the effects of radius and thickness of alloy nanoparticles on the NEF and FFS spectra, with and without considering electron-surface scattering. Furthermore, the tunability of plasmon resonance wavelength in dielectric core-metal alloy nanoshells and metal core-metal alloy nanoshells was compared.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Biophysics
B. A. Noskov, A. V. Akentiev, A. G. Bykov, G. Loglio, R. Miller, O. Yu. Milyaeva
Summary: The properties of adsorbed layers of protein fibrils and the spread layers on an aqueous subphase differ significantly. The surface elasticity of Lysozyme (LYS) and 8-lactoglobulin (BLG) spread layers on the surface of 0.1 M NaCl solution is more than two times higher than protein solutions with the same NaCl concentration, possibly due to lower surface concentrations of hydrolysed peptides in the latter case. The properties and morphology of the spread and adsorbed layers depend noticeably on the ionic strength of the aqueous bulk phase, especially for LYS layers which are more prone to the formation of macroscopic and mesoscopic surface aggregates compared to BLG layers.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2022)
Article
Chemistry, Physical
L. A. M. Al-Sagheer, A. Alshahrie, Waleed E. Mahmoud
Summary: A facile method was reported for preparing high purity gold nanorods, functionalized with mercaptoproponic acid, leading to stable dispersion in water. The aspect ratio of gold nanorods, controlled by reaction time, showed low cytotoxicity with a 4.3 aspect ratio resulting in 92% cell survival. In vivo studies in mice demonstrated progressive tumor reduction and complete disappearance within four weeks after NIR-laser irradiation of mice injected with these nanorods.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Biophysics
McKenzie B. Riley, Evan Strandquist, Christopher S. Weitzel, Jeremy D. Driskell
Summary: Research shows that the thiolated analog of a protein has a greater affinity for gold nanoparticles (AuNPs) and is able to form a robust hard corona, maintaining structure and function, compared to the unmodified protein which denatures with prolonged exposure to AuNPs resulting in loss of enzymatic function.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2022)
Review
Nuclear Science & Technology
P. D. Townsend, Y. Wang, S. W. S. McKeever
Summary: Experimental evidence shows that defect sites in luminescent materials are complexes extending over multiple lattice sites. Recombination processes in these materials involve charge transfer via both delocalized and localized mechanisms, influenced by various clustering mechanisms and recombination pathways resulting from defect cluster formation. There is no obvious route to optimizing parameters, requiring trial and error through massive experimentation.
RADIATION MEASUREMENTS
(2021)
Article
Optics
Da-Jie Yang, Song-Jin Im, Hai-Wen Huang, Chol-Song Ri, Kum-Dong Kim, Kil-Song Song, Ji-Cai Liu, Qu-Quan Wang
Summary: This paper reveals the effects of structured light carrying orbital angular momentum (OAM) on surface plasmons, showing anomalous plasmon excitations and couplings under OAM beams. The excitation of single particles is determined by both photon spin angular momentum (SAM) and OAM, and is influenced by particle locations. Fano resonance is observed in a nanorod dimer, with one rod aligned along light propagation direction as the bright mode and the other aligned along global polarization direction as the dark mode.
PHOTONICS RESEARCH
(2023)
Article
Physics, Multidisciplinary
Tian Xiao-Jun, Kong Fan-Fang, Jing Shi-Hao, Yu Yun-Jie, Zhang Yao, Zhang Yang, Dong Zhen-Chao
Summary: This study investigates the vibronic coupling within a single PTCDA molecule in a transiently charged state by imaging the spatial distribution of single-molecule electroluminescence. The observed changes in the spatial pattern of the emission reveal the occurrence of strong vibronic coupling and demonstrate the influence of vibrational states on the transition dipole orientation. The results provide new insights into the microscopic understanding of vibronic coupling within a single molecule.
ACTA PHYSICA SINICA
(2022)
Article
Chemistry, Multidisciplinary
Kang Ma, Tiantong Zhang, Ying Qin, Zhixin Hu, Zhixiang Sun, You Han, Dongbing Zhao, Hong-Ying Gao
Summary: C(sp2)-Si bond cleavage and subsequent C-C bond formation on metal surfaces represents a challenging task in on-surface chemistry. This study demonstrates the successful implementation of this reaction by incorporating C-Br group on arylsilanes, providing a promising approach for the removal of protecting silyl groups in on-surface chemistry.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Nanoscience & Nanotechnology
Fan-Fang Kong, Xiao-Jun Tian, Yang Zhang, Yao Zhang, Gong Chen, Yun-Jie Yu, Shi-Hao Jing, Hong-Ying Gao, Yi Luo, Jin-Long Yang, Zhen-Chao Dong, J. G. Hou
Summary: This study demonstrates a transition from incoherent to coherent electronic energy transfer in donor-acceptor model systems by precisely controlling the separations. Through scanning tunnelling microscopy induced luminescence, two new emission peaks were observed with decreasing intermolecular distance. The spatially resolved spectroscopic images of the redshifted emission reveal a delocalized nature of the excitonic state over the whole heterodimer, suggesting a coherent wave-like transfer of the excitons.
NATURE NANOTECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Ben Yang, Gong Chen, Atif Ghafoor, Yu-Fan Zhang, Xian-Biao Zhang, Hang Li, Xiao-Ru Dong, Rui-Pu Wang, Yang Zhang, Yao Zhang, Zhen-Chao Dong
Summary: We investigated the chemical effects on Raman signals in surface enhanced Raman spectroscopy (SERS) through tip-enhanced Raman spectroscopy (TERS) of a single planar ZnPc molecule with controlled contact environments. TERS signals were enhanced when a tip-molecule point contact was made, due to the generation of a ground-state charge-transfer induced vertical Raman polarizability and the strong vertical plasmonic field in the nanocavity. However, TERS signals were quenched when ZnPc was chemisorbed flatly on substrates, attributed to the Raman polarizability screening effect induced by interfacial dynamic charge transfer.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Hang Li, Zi-Xi Tang, Jun-Xian Zhang, Xian-Biao Zhang, Yu-Fan Zhang, Yang Zhang, Yao Zhang, Zhen-Chao Dong
Summary: In this study, the adsorption configurations and on-surface dimerization of PNTP molecules on Ag substrate were investigated using single-molecule tip-enhanced Raman spectroscopy (TERS). The results indicate that the bare metal surface at sub-monolayer coverages plays a crucial role in the movement of molecules and activation of on-surface dimerization.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Thermodynamics
Hoang Thi Thanh Tam, Mana Toma, Takayuki Okamoto, Mio Hidaka, Kensuke Fujii, Yasuhiro Kuwana, Kotaro Kajikawa
Summary: This article reports the use of a highly transparent fluoropolymer LF for efficient daytime radiative cooling. LF is weatherable, solvent-soluble, and paintable, and its cooling effect stems from the vibrations of the carbon-fluorine bond. The study found that LF demonstrates high cooling efficiency in practical use.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Chemistry, Physical
Yongjing Wang, Kang Ma, Tiantong Zhang, Philipp Alexander Held, Armido Studer, Harald Fuchs, Zhixin Hu, Zhixiang Sun, You Han, Hong-Ying Gao
Summary: The effect of iodine on modulating the self-assembly structures of organic molecules on metal surfaces was systematically studied. By using low-temperature scanning tunneling microscopy and density functional theory, the transformation of molecular self-assembly structures induced by iodine dosing on the Ag(111) surface was explored. It was found that iodine can modulate the self-assembly structure of organic molecules with weak intermolecular interaction, while those with stronger intermolecular hydrogen bonding are not affected. These findings were confirmed by density functional theory calculations.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Review
Chemistry, Multidisciplinary
Tamitake Itoh, Marek Prochazka, Zhen-Chao Dong, Wei Ji, Yuko S. Yamamoto, Yao Zhang, Yukihiro Ozaki
Summary: Surface-enhanced Raman scattering (SERS) and tip-enhanced Raman scattering (TERS) have opened up exciting research fields, but their practical applications are still limited. This review aims to update the recent fundamental and application studies of SERS and TERS and explore new directions and perspectives by combining their mechanisms and applications. It discusses topics such as plasmonic hotspots for SERS, angstrom-resolved TERS, chemical mechanisms, and bridging the gap between mechanism studies and applications.
Article
Chemistry, Multidisciplinary
Huimei Wang, Kang Ma, Xi Chen, Zhixin Hu, Zhixiang Sun, Hong-Ying Gao
Summary: Using low-temperature scanning tunnelling microscopy, we investigated the coordination and covalent structures formed by 1,4-dibromonaphthalene (1,4-DBN) on Ag(111) surface. We found three ordered structures (phase I, II, III) and one metal-organic short-chain structure (phase IV) at high coverage, as well as a new type of chiral structure (phase V) coexisting with phase II, III, IV at low coverage. Notably, all these structures incorporate surface Ag adatoms. Furthermore, we demonstrated that thermal annealing can induce Ullmann coupling and cyclodehydrogenation of 1,4-DBN to form armchair-shaped graphene nanoribbons. Our results highlight the critical role of surface Ag adatoms in self-assembly and on-surface reactions.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Physics, Atomic, Molecular & Chemical
Jia-Zhe Zhu, Gong Chen, Zhen-Chao Dong
Summary: It is found that an atomic-scale protrusion on the substrate can significantly enhance the quantum efficiency of a horizontal dipole emitter, similar to the situation with a protrusion at the tip apex in a silver plasmonic nanocavity. However, in a double-protrusion junction geometry with atomic-scale protrusion on both the tip and the substrate, there is no improvement in the quantum efficiency compared to the mono-protrusion situation.
CHINESE JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Instruments & Instrumentation
Yun-Jie Yu, Yan Kuai, Yong-Tao Fan, Liang-Fu Zhu, Fan-Fang Kong, Xiao-Jun Tian, Shi-Hao Jing, Li Zhang, Dou-Guo Zhang, Yao Zhang, Yang Zhang, Zhen-Chao Dong
Summary: In this study, a compact all-in-one sample holder was designed to achieve back focal plane (BFP) imaging in a low-temperature ultrahigh-vacuum scanning tunneling microscope (STM). The performance of the BFP imaging system was tested by measuring the photoluminescence from dye-doped polystyrene beads on a thin Ag film. The feasibility of the BFP imaging system was demonstrated and its capability for STM induced electroluminescence measurements was also shown.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Nanoscience & Nanotechnology
Jun-Xian Zhang, Qiu-Shi Meng, Gong Chen, Yang Zhang, Yao Zhang, Zhen-Chao Dong
Summary: Recent developments in tip-enhanced Raman spectroscopy (TERS) have demonstrated its capabilities in lateral resolution down to the Ångström scale and chemical identification of adjacent molecules at the submolecular level. However, the vertical resolution ability of TERS, especially in resolving vertical heteromolecular structures, remains elusive. In this work, a bilayer-molecular system was constructed to quantitatively investigate the vertical resolving ability of TERS. The presence of a molecule at the tip apex was found to influence the local plasmonic field and extend the vertical detection depth, demonstrating the capability of TERS to resolve vertical heteromolecular structures.
Article
Chemistry, Analytical
H. Takei, N. Saito, T. Okamoto, K. Watanabe, M. Westphal, R. Tomioka, A. Goelzhaeuser
Summary: We have developed a SERS stamp that can be pressed directly onto a solid surface for characterization of surface-adsorbed target molecules. The performance of the stamp was evaluated by exposing it to different substances and considering factors such as nanosphere diameter, metal deposition thickness, and the extent of burial of the nanospheres into the adhesive tape. The well-characterized SERS stamp is expected to shed light on the transfer process of target molecules and serve as a new SERS platform.
Article
Nanoscience & Nanotechnology
Jie Cui, Yao Zhang, Zhen-Chao Dong
Summary: This study proposes an atomistic polarization model to simulate the Raman spectra of large metal tips, which helps to understand the role of atomic structures in Raman-enhanced spectroscopy.
Article
Physics, Atomic, Molecular & Chemical
Xian-Biao Zhang, Yu-Fan Zhang, Hang Li, Jie Cui, Song Jiang, Ben Yang, Yang Zhang, Yao Zhang, Zhen-Chao Dong
Summary: This study presents a controllable method for preparing TERS-active tips and proposes two important criteria for judging the TERS activity of tips. The work provides an effective way to fabricate and judge TERS-active tips quickly before real TERS experiments.
CHINESE JOURNAL OF CHEMICAL PHYSICS
(2022)
