Measurement of discrete energy-level spectra in individual chemically-synthesized gold nanoparticles

Graphene Nanoribbons on Hexagonal Boron Nitride: Deposition and Transport Characterization

Chemically synthesized "cove"-type graphene nanoribbons (cGNRs) of different widths were brought into dispersion and drop-cast onto exfoliated hexagonal boron nitride (hBN) on a Si/SiO2 chip. With AFM we observed that the cGNRs form ordered domains aligned along the crystallographic axes of the hBN. Using electron beam lithography and metallization, we contacted the cGNRs with NiCr/Au, or Pd contacts and measured their I-V-characteristics. The transport through the ribbons was dominated by the Schottky behavior of the contacts between the metal and the ribbon.

宽带单粒子吸收圆二色性揭示金螺旋体的手性光学异质性

Broadband Single-Particle Absorption Circular Dichroism Reveals Chiroptical Heterogeneity in Gold Helicoids

本研究提出宽带单粒子吸收圆二色光谱法，直接测量金螺旋体的吸收不对称因子，揭示单个粒子在手性响应上的显著异质性，为纳米手性光学提供新探针。

Single Molecule SERS in a Single Gold Nanoparticle-driven Thermoplasmonic Tweezer

Surface enhanced Raman scattering (SERS) is optically sensitive and chemically specific to detect single molecule spectroscopic signatures. Facilitating this capability in optically-trapped nanoparticles at low laser power remains a significant challenge. In this letter, we show single molecule SERS signatures in reversible assemblies of trapped plasmonic nanoparticles using a single laser excitation (633 nm). Importantly, this trap is facilitated by the thermoplasmonic field of a single gold nanoparticle dropcasted on a glass surface. We employ bi-analyte SERS technique to ascertain the singl…

CdSe-Au nanorod networks welded by gold domains - a promising structure for nano-optoelectronic components

CdSe-Au networks were synthesized by a colloidal chemistry technique. They entail CdSe nanorods with a diameter of ~10 nm and a length of ~40 nm, which are joined together by Au domains (~5 nm). Individual networks were positioned by AC dielectrophoresis between bow-tie electrodes with a gap of ~100 nm and their conductivity as well as the photoelectrical properties were investigated. Nanorod networks, with multiple Au domains on the nanorod surface, displayed stable conductivity that was not sensitive to blue laser light illumination. Such nanostructures were transformed by thermal annealing …

溶质金纳米颗粒中热量传输的综述：分子动力学建模与实验视角

A review of heat transport in solvated gold nanoparticles: Molecular dynamics modeling and experimental perspectives

本文综述了溶质金纳米颗粒中热量传输的最新研究，通过分子动力学模拟和实验技术探讨热传导机制及优化热等离子应用。

定位金纳米颗粒硬-软界面处的原子

Locating the Atoms at the Hard-soft Interface of Gold Nanoparticles

本文通过发展四维扫描透射电子显微镜低剂量成像方法，实现了对金纳米颗粒硬-软界面处铜添加剂和溴化物表面活性剂原子的直接观测与原子间距离定量，为理解表面化学在纳米晶生长中的作用提供了原子级依据。

One-dimensional Weak Localization of Electrons in a Single InAs Nanowire

We report on low temperature (2-30K) electron transport and magneto-transport measurements of a chemically synthesized InAs nanowire. Both the temperature, T, and transverse magnetic field dependences of the nanowire conductance are consistent with the functional forms predicted in one-dimensional (1D) weak localization theory. By fitting the magneto-conductance data to theory, the phase coherence length of electrons is determined to be tens of nanometers with a T-1/3 dependence. Moreover, as the electron density is increased by a gate voltage, the magneto-conductance shows a possible signatur…

Manipulating Acoustic and Plasmonic Modes in Gold Nanostars

In this contribution experimental evidence of plasmonic edge modes and breathing acoustic modes in gold nanostars (AuNS) is reported. AuNS are synthesized in a surfactant-free, one-step wet-chemistry method. Optical extinction measurements of AuNS confirm the presence of localized surface plasmon resonances (LSPRs), while electron energy-loss spectroscopy (EELS) in the scanning transmission electron microscope (STEM) shows the spatial distribution of LSPRs and reveals the presence of acoustic breathing modes. Plasmonic hot-spots generated at the pinnacle of the sharp spikes, due to the optical…

用于高效热载流子收集和光电压探测的片上单晶等离激元光电子学

On-chip Single-crystal Plasmonic Optoelectronics for Efficient Hot Carrier Collection and Photovoltage Detection

本文提出一种基于合成金薄片纳米线的单晶等离激元光电子学平台，通过抑制电子-声子散射提升热载流子隧穿效率，实现了比多晶器件高一个数量级的光电压探测性能。

单分子固-分子接点中能量传输动力学与高热导率的直接观测

Direct Observation of Energy Transport Dynamics and High Thermal Conductance across Single Solid-Molecule Junctions

通过超快电子衍射观察到单分子固-分子接点中能量传输动力学及高热导率，揭示了界面热传导机制与弹道热传递特性。

Large specific absorption rates in the magnetic hyperthermia properties of metallic iron nanocubes

We report on the magnetic hyperthermia properties of chemically synthesized ferromagnetic 11 and 16 nm Fe(0) nanoparticles of cubic shape displaying the saturation magnetization of bulk iron. The specific absorption rate measured on 16 nm nanocubes is 1690+-160 W/g at 300 kHz and 66 mT. This corresponds to specific losses-per-cycle of 5.6 mJ/g, largely exceeding the ones reported in other systems. A way to quantify the degree of optimization of any system with respect to hyperthermia applications is proposed. Applied here, this method shows that our nanoparticles are not fully optimized, proba…

铅纳米颗粒，从深紫外到近红外的等离子体平台

Lead nanoparticles, the deep-ultraviolet to near-infrared plasmonic platform

研究铅纳米颗粒在等离子体应用中的性能，通过扫描透射电子显微镜和电子能量损失谱评估其光学性质，发现其支持从近红外到深紫外的局域表面等离子体共振，具有作为多光谱等离子体平台的潜力。