journal
https://read.qxmd.com/read/38905483/fluorescence-screening-of-dna-agncs-with-pulsed-white-light-excitation
#1
JOURNAL ARTICLE
Mikkel Baldtzer Liisberg, Tom Vosch
DNA-stabilized silver nanoclusters (DNA-AgNCs) are a class of fluorophores with interesting photophysical properties dominated by the choice of DNA sequence. Screening methods with ultraviolet excitation and steady state well plate readers have previously been used for deepening the understanding between DNA sequence and emission color of the resulting DNA-AgNCs. Here, we present a new method for screening DNA-AgNCs by using pulsed white light excitation (λex ≈ 490-900 nm). By subtraction and time gating we are able to circumvent the dominating scatter of the white excitation light and extract both temporally and spectrally resolved emission of DNA-AgNCs over the visible to near-infrared range...
June 21, 2024: Nano Letters
https://read.qxmd.com/read/38904438/terahertz-spin-conductance-spectroscopy-probing-coherent-and-incoherent-ultrafast-spin-tunneling
#2
JOURNAL ARTICLE
Reza Rouzegar, Mohamed Amine Wahada, Alexander L Chekhov, Wolfgang Hoppe, Genaro Bierhance, Jiří Jechumtál, Lukáš Nádvorník, Martin Wolf, Tom S Seifert, Stuart S P Parkin, Georg Woltersdorf, Piet W Brouwer, Tobias Kampfrath
Thin-film stacks <mml:math xmlns:mml="https://www.w3.org/1998/Math/MathML"><mml:mi>F</mml:mi></mml:math>|<mml:math xmlns:mml="https://www.w3.org/1998/Math/MathML"><mml:mi>H</mml:mi></mml:math> consisting of a ferromagnetic-metal layer <mml:math xmlns:mml="https://www.w3.org/1998/Math/MathML"><mml:mi>F</mml:mi></mml:math> and a heavy-metal layer <mml:math xmlns:mml="https://www.w3.org/1998/Math/MathML"><mml:mi>H</mml:mi></mml:math> are spintronic model systems...
June 21, 2024: Nano Letters
https://read.qxmd.com/read/38904329/enhancing-the-thermoelectric-and-mechanical-properties-of-p-type-pbs-through-band-convergence-and-microstructure-regulation
#3
JOURNAL ARTICLE
Mengyao Li, Xueke Zhao, Dongyang Wang, Xu Han, Dawei Yang, Benteng Wu, Hongzhang Song, Mochen Jia, Yu Liu, Jordi Arbiol, Andreu Cabot
While lead sulfide shows notable thermoelectric properties, its production costs remain high, and its mechanical hardness is low, which constrains its commercial viability. Herein, we demonstrate a straightforward and cost-effective method to produce PbS nanocrystals at ambient temperature. By introducing controlled amounts of silver, we achieve p-type conductivity and fine-tune the energy band structure and lattice configuration. Computational results show that silver shifts the Fermi level into the valence band, facilitating band convergence and thereby enhancing the power factor...
June 21, 2024: Nano Letters
https://read.qxmd.com/read/38904300/heterostructured-pt-pbs-nanobelt-achieves-remarkable-direct-formic-acid-oxidation-catalysis
#4
JOURNAL ARTICLE
Liangbin Liu, Lujie Jin, Zhengyi Xiao, Nan Fang, Xin Lin, Yujin Ji, Yucheng Wang, Youyong Li, Xiaoqing Huang, Lingzheng Bu
Developing efficient and CO-tolerant platinum (Pt)-based anodic catalysts is challenging for a direct formic acid fuel cell (DFAFC). Herein, we report heterostructured Pt-lead-sulfur (PtPbS)-based nanomaterials with gradual phase regulation as efficient formic acid oxidation reaction (FAOR) catalysts. The optimized Pt-PbS nanobelts (Pt-PbS NBs/C) display the mass and specific activities of 5.90 A mgPt -1 and 21.4 mA cm-2 , 2.2/1.2, 1.5/1.1, and 36.9/79.3 times greater than those of PtPb-PbS NBs/C, Pt-PbSO4 NBs/C, and commercial Pt/C, respectively...
June 21, 2024: Nano Letters
https://read.qxmd.com/read/38904278/anomalous-phonon-behavior-and-tunable-exciton-emissions-insights-into-pressure-driven-dynamics-in-silicon-phosphide
#5
JOURNAL ARTICLE
Xing Xie, Junnan Ding, Biao Wu, Shaofei Li, Junying Chen, Jun He, Zongwen Liu, Jian-Tao Wang, Yanping Liu
IV-V two-dimensional materials have emerged as key contenders for polarization-sensitive and angle-resolved devices, given their inherent anisotropic physical properties. While these materials exhibit intriguing high-pressure quasi-particle behavior and phase transition, the evolution of quasi-particles and their interactions under external pressure remain elusive. Here, employing a diamond anvil cell and spectroscopic measurements coupled with first-principles calculations, we unveil rarely observed pressure-induced phonon-phonon coupling in layered SiP flakes...
June 21, 2024: Nano Letters
https://read.qxmd.com/read/38904269/jellyfish-inspired-self-healing-luminescent-elastomers-based-on-borate-nanoassemblies-for-dual-model-encryption
#6
JOURNAL ARTICLE
Bo Zhou, Xin Yang, Jize Liu, Lidan Lan, Hao Lu, Yuyan Wang, Zhenbo Wei, Xinxing Zhang
Responsive luminescent materials that reversibly react to external stimuli have emerged as prospective platforms for information encryption applications. Despite brilliant achievements, the existing fluorescent materials usually have low information density and experience inevitable information loss when subjected to mechanical damage. Here, inspired by the hierarchical nanostructure of fluorescent proteins in jellyfish, we propose a self-healable, photoresponsive luminescent elastomer based on dynamic interface-anchored borate nanoassemblies for smart dual-model encryption...
June 21, 2024: Nano Letters
https://read.qxmd.com/read/38904262/interfacial-layers-with-desolvation-function-induced-stable-deposition-of-lithium-metal-for-long-cycling-lithium-metal-batteries
#7
JOURNAL ARTICLE
Zongtao Qu, Kaixuan Chen, Wenkang Wang, Yao Dai, Xia Lu, Shu-Shen Lyu
The unstable solid electrolyte interface (SEI) formed by uncontrollable electrolyte degradation, which leads to dendrite growth and Coulombic efficiency decay, hinders the development of Li metal anodes. A controllable desolvation process is essential for the formation of stable SEI and improved lithium metal deposition behavior. Here, we show a functional artificial interface protective layer comprised of chondroitin sulfate-reduced graphene oxide (CrG), on which polar functional groups are distributed to effectively reduce the energy barrier for desolvation of Li+ and effectively alienate solvent molecules to avoid solvent involvement in SEI formation, thus promoting the formation of a LiF-rich SEI...
June 21, 2024: Nano Letters
https://read.qxmd.com/read/38901035/regulating-second-coordination-shell-of-ce-atom-site-and-reshaping-of-carrier-enable-single-atom-nanozyme-to-efficiently-express-oxidase-like-activity
#8
JOURNAL ARTICLE
Qijun Sun, Meng Wu, Na Niu, Ligang Chen, Song Liu, Jie Yu, Xinzhao Wu, Fu-Quan Bai, Piaoping Yang
Single-atom nanozymes (SANs) are considered to be ideal substitutes for natural enzymes due to their high atom utilization. This work reported a strategy to manipulate the second coordination shell of the Ce atom and reshape the carbon carrier to improve the oxidase-like activity of SANs. Internally, S atoms were symmetrically embedded into the second coordination layer to form a Ce-N4 S2 -C structure, which reduced the energy barrier for O2 reduction, promoted the electron transfer from the Ce atom to O atoms, and enhanced the interaction between the d orbital of the Ce atom and p orbital of O atoms...
June 20, 2024: Nano Letters
https://read.qxmd.com/read/38901032/ultrafast-coherent-exciton-couplings-and-many-body-interactions-in-monolayer-ws-2
#9
JOURNAL ARTICLE
Daniel Timmer, Moritz Gittinger, Thomas Quenzel, Alisson R Cadore, Barbara L T Rosa, Wenshan Li, Giancarlo Soavi, Daniel C Lünemann, Sven Stephan, Martin Silies, Tommy Schulz, Alexander Steinhoff, Frank Jahnke, Giulio Cerullo, Andrea C Ferrari, Antonietta De Sio, Christoph Lienau
Transition metal dichalcogenides (TMDs) are quantum confined systems with interesting optoelectronic properties, governed by Coulomb interactions in the monolayer (1L) limit, where strongly bound excitons provide a sensitive probe for many-body interactions. Here, we use two-dimensional electronic spectroscopy (2DES) to investigate many-body interactions and their dynamics in 1L-WS2 at room temperature and with sub-10 fs time resolution. Our data reveal coherent interactions between the strongly detuned A and B exciton states in 1L-WS2 ...
June 20, 2024: Nano Letters
https://read.qxmd.com/read/38901023/a-resonance-sensitive-ultralow-frequency-raman-mode-in-twisted-bilayer-graphene
#10
JOURNAL ARTICLE
Shuowen Yan, Jianqi Huang, He Hao, Ge Song, Yuechen Wang, Hailin Peng, Teng Yang, Jin Zhang, Lianming Tong
Twisted bilayer graphene (tBLG) possesses intriguing physical properties including unconventional superconductivity, enhanced light-matter interaction due to the formation of van Hove singularities (vHS), and a divergence of density of states in the electronic band structures. The vHS energy band gap provides optical resonant transition channels that can be tuned by the twist angle and interlayer coupling. Raman spectroscopy provides rich information on the vHS structure of tBLG. Here, we report the discovery of an ultralow-frequency Raman mode at ∼49 cm-1 in tBLG...
June 20, 2024: Nano Letters
https://read.qxmd.com/read/38900975/insight-into-facile-ion-diffusion-in-resistive-switching-medium-toward-low-operating-voltage-memory
#11
JOURNAL ARTICLE
Dinh Phuc Do, Viet Q Bui, Minh Chien Nguyen, Sohyeon Seo, Van Dam Do, Joosung Kim, Jungsue Choi, Hyun Ko, Woo Jong Yu, Yoshiyuki Kawazoe, Hyoyoung Lee
The rapid increase in data storage worldwide demands a substantial amount of energy consumption annually. Studies looking at low power consumption accompanied by high-performance memory are essential for next-generation memory. Here, Graphdiyne oxide (GDYO), characterized by facile resistive switching behavior, is systematically reported toward a low switching voltage memristor. The intrinsic large, homogeneous pore-size structure in GDYO facilitates ion diffusion processes, effectively suppressing the operating voltage...
June 20, 2024: Nano Letters
https://read.qxmd.com/read/38900138/a-biphasic-strategy-to-synergistically-accelerate-activation-and-co-spillover-in-formic-acid-oxidation-catalysis
#12
JOURNAL ARTICLE
Changhong Zhan, Haoran Sun, Wei Yan, Jing Xia, Xiang-Min Meng, Tongtong Li, Lingzheng Bu, Qingyu Kong, Haixin Lin, Wei Liu, Xiaoqing Huang, Nanjun Chen
Developing highly efficient and carbon monoxide (CO)-tolerant platinum (Pt) catalysts for the formic acid oxidation reaction (FAOR) is vital for direct formic acid fuel cells (DFAFCs), yet it is challenging due to the high energy barrier of direct intermediates (HCOO* and COOH*) as well as the CO poisoning issues associated with Pt alloy catalysts. Here we present a versatile biphasic strategy by creating a hexagonal/cubic crystalline-phase-synergistic PtPb/C ( h / c -PtPb/C) catalyst to tackle the aforementioned issues...
June 20, 2024: Nano Letters
https://read.qxmd.com/read/38899935/interlayer-electric-multipoles-induced-by-in-plane-field-from-quantum-geometric-origins
#13
JOURNAL ARTICLE
Huiyuan Zheng, Dawei Zhai, Cong Xiao, Wang Yao
We show that interlayer charge transfer in 2D materials can be driven by an in-plane electric field, giving rise to electrical multipole generation in linear and second order in-plane field. The linear and nonlinear effects have quantum geometric origins in the Berry curvature and quantum metric, respectively, defined in extended parameter spaces characteristic of layered materials. We elucidate their symmetry characters and demonstrate sizable dipole and quadrupole polarizations, respectively, in twisted bilayers and trilayers of transition metal dichalcogenides...
June 20, 2024: Nano Letters
https://read.qxmd.com/read/38899856/generation-and-propagation-of-ultrafast-terahertz-magnons-in-atomically-architectured-nanomagnets
#14
JOURNAL ARTICLE
Khalil Zakeri, Arthur Ernst
Utilizing ultrafast terahertz (THz) magnons, the quanta of collective magnetic excitations, as carriers may provide a promising alternative to overcome the problems associated with electrical losses in nanoelectronic devices and circuits. However, efficient excitation of propagating coherent THz magnons in magnonic nanowaveguides is an essential requirement for the development of such devices. Here, by growing ultrathin ferromagnetic nanostructures on a reconstructed surface, we create well-ordered periodic magnetic nanostripes...
June 20, 2024: Nano Letters
https://read.qxmd.com/read/38899810/adaptive-signal-modulation-evolved-by-the-inherent-nonlinearity-of-phase-change-quantum-dot-string
#15
JOURNAL ARTICLE
Qin Wan, Fei Zeng, Ziao Lu, Junwei Yu, Tongjin Chen, Feng Pan
To simulate a topological neural network handling weak signals via stochastic resonance (SR), it is necessary to introduce an inherent nonlinearity into nanoscale devices. We use the self-assembly method to successfully fabricate a phase-change quantum-dot string (PCQDS) crossing Pd/Nb:AlNO/AlNO/Nb:AlNO/Pd multilayer. The inherent nonlinearity of phase change couples with electron tunneling so that PCQDS responds to a long signal sequence in a modulated output style, in which the pulse pattern evolves to that enveloped by two sets of periodic wave characterized by neural action potential...
June 20, 2024: Nano Letters
https://read.qxmd.com/read/38899791/enhanced-electromechanical-response-due-to-inhomogeneous-strain-in-monolayer-mos-2
#16
JOURNAL ARTICLE
Claire M Ganski, Alex C De Palma, Edward T Yu
2D transition metal dichalcogenides (TMDs) exhibit exceptional resilience to mechanical deformation. Applied strain can have pronounced effects on properties such as the bandgaps and exciton dynamics of TMDs, via deformation potentials and electromechanical coupling. In this work, we use piezoresponse force microscopy to show that the inhomogeneous strain from nanobubbles produces dramatic, localized enhancements of the electromechanical response of monolayer MoS2 . Nanobubbles with diameters under 100 nm consistently produce an increased piezoresponse that follows the features' topography, while larger bubbles exhibit a halo-like profile, with maximum piezoresponse near the periphery...
June 20, 2024: Nano Letters
https://read.qxmd.com/read/38889449/toward-fully-multiferroic-van-der-waals-spinfets-basic-design-and-quantum-calculations
#17
JOURNAL ARTICLE
Mario Castro, Guidobeth Saéz, Patricio Vergara Apaz, Sebastián Allende, Alvaro S Nunez
Manipulating spin transport enhances the functionality of electronic devices, allowing them to surpass physical constraints related to speed and power. For this reason, the use of van der Waals multiferroics at the interface of heterostructures offers promising prospects for developing high-performance devices, enabling the electrical control of spin information. Our work focuses primarily on a mechanism for multiferroicity in two-dimensional van der Waals materials that stems from an interplay between antiferromagnetism and the breaking of inversion symmetry in certain bilayers...
June 18, 2024: Nano Letters
https://read.qxmd.com/read/38889312/electron-drag-effect-on-thermal-conductivity-in-two-dimensional-semiconductors
#18
JOURNAL ARTICLE
Yujie Quan, Bolin Liao
Two-dimensional (2D) materials have shown great potential in applications as transistors, where thermal dissipation becomes crucial because of the increasing energy density. Although the thermal conductivity of 2D materials has been extensively studied, interactions between nonequilibrium electrons and phonons, which can be strong when high electric fields and heat current coexist, are not considered. In this work, we systematically study the electron drag effect, where nonequilibrium electrons impart momenta to phonons and influence the thermal conductivity, in 2D semiconductors using ab initio simulations...
June 18, 2024: Nano Letters
https://read.qxmd.com/read/38888554/probing-correlation-of-optical-emission-and-defect-sites-in-hexagonal-boron-nitride-by-high-resolution-stem-eels
#19
JOURNAL ARTICLE
Sakal Singla, Pragya Joshi, Gabriel I López-Morales, Suman Sarkar, Suman Sarkar, Johannes Flick, Biswanath Chakraborty
Optically bright emitters in hexagonal boron nitride (hBN) often acting as a source of a single-photon are mostly attributed to point-defect centers, featuring localized intra-bandgap electronic states. Although vacancies, anti-sites, and impurities have been proposed as candidates, the exact physical and chemical nature of most hBN single-photon emitters (SPEs) within the visible region are still up for debate. Combining site-specific high-angle annular dark-field imaging (HAADF) with electron energy loss spectroscopy (EELS), we resolve and identify a few carbon substitutions among neighboring hBN hexagons, all within the same sample region, from which typical defect emission is observed...
June 18, 2024: Nano Letters
https://read.qxmd.com/read/38888317/dynamic-regulation-of-cell-mechanotransduction-through-sequentially-controlled-mobile-surfaces
#20
JOURNAL ARTICLE
Wenyan Xie, Linjie Ma, Peng Wang, Xiaojing Liu, Di Wu, Yuan Lin, Zhiqin Chu, Yong Hou, Qiang Wei
The physical properties of nanoscale cell-extracellular matrix (ECM) ligands profoundly impact biological processes, such as adhesion, motility, and differentiation. While the mechanoresponse of cells to static ligands is well-studied, the effect of dynamic ligand presentation with "adaptive" properties on cell mechanotransduction remains less understood. Utilizing a controllable diffusible ligand interface, we demonstrated that cells on surfaces with rapid ligand mobility could recruit ligands through activating integrin α5β1, leading to faster focal adhesion growth and spreading at the early adhesion stage...
June 18, 2024: Nano Letters
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