Materials Literature
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Here we report experimental results for a carbon nanotube (CNT) based amplitude-modulated (AM) demodulator for modulation frequencies up to 100 kHz. Further, the CNT based demodulator was successfully demonstrated in an actual AM radio receiver operating at a carrier frequency of 1 GHz and capable of demodulating high…
This work considers the g-tensor anisotropy induced by the flexural thermal vibrations in one-dimensional structures and its role in electron spin relaxation. In particular, the mechanism of spin-lattice relaxation via flexural modes is studied theoretically for localized and delocalized electronic states in semicondu…
Here we explore the radiation features of optical nanoantennas, analyzing the concepts of input impedance, optical radiation resistance, impedance matching and loading of plasmonic nanodipoles. We discuss how the concept of antenna impedance may be applied to optical frequencies, and how its quantity may be properly d…
Ferromagnetic resonance has been used to study the magnetic properties and magnetization dynamics of polycrystalline Fe$_{1-x}$V$_{x}$ alloy films with $0\leq x < 0.7$. Films were produced by co-sputtering from separate Fe and V targets, leading to a composition gradient across a Si substrate. FMR studies were conduct…
We have observed temperature-dependent reversal of the rectifying polarity in $\mathrm{Au}∕\mathrm{Nb}:\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$ Schottky junctions. By simulating current-voltage characteristics, we have found that the permittivity of $\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$ near the interface exhibits t…
We use optical-pump terahertz-probe spectroscopy to investigate the near-threshold behavior of the photoinduced insulator-to-metal (IM) transition in vanadium dioxide thin films. Upon approaching Tc a reduction in the fluence required to drive the IM transition is observed, consistent with a softening of the insulatin…
The ultrafast dynamics of surface electromagnetic waves photogenerated on aluminum film perforated with subwavelength holes array was studied in the visible spectral range by the technique of transient photomodulation with 100 fs time resolution. We observed a pronounced blueshift of the resonant transmission band tha…
We have made very thin films of $\mathrm{La}\mathrm{Al}{\mathrm{O}}_{3}$ on $\mathrm{Ti}{\mathrm{O}}_{2}$ terminated $\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$ and have measured the properties of the resulting interface in various ways. Transport measurements show a maximum sheet carrier density of ${10}^{16}\phantom{\r…
Using the density functional theory, we have demonstrated the chemical functionalization of semiconducting graphene nanoribbons (GNRs) with Stone-Wales (SW) defects by carboxyl (COOH) groups. It is found that the geometrical structures and electronic properties of the GNRs changed significantly, and the electrical con…
Restraining electromagnetic interference in the millimeter-wave region has been accomplished with a new electromagnetic absorber composed of ε-GaxFe2−xO3 (0.10≤x≤0.67) nanomagnets, which shows a ferromagnetic resonance in the range 35–147 GHz. The possibility that the ferromagnetic resonance can achieve a frequency of…
Enzymatic formation of supramolecular nanofibers is demonstrated as a novel approach to induce intracellular hydrogelation and control the fate of cells or cellular functions, which can lead to a new paradigm for developing biomaterials to manage cellular artificial nanostructures (CAN), understand cellular functions…
Diagnosis and treatment all in one: Multifunctional magneto-polymeric nanohybrids (MMPNs) have been synthesized using ultrasensitive MnFe2O4 nanocrystals, chemotherapeutic agents, and encapsulating amphiphilic block copolymers for targeted detection by MRI and treatment of breast cancer. See the TEM image (left) of an…
Abstract Au and Ag nanoparticles have optical properties that have made them useful as tags in a wide variety of measurement schemes. This Progress Report discusses several different schemes in which Au and Ag nanoparticles have been used as surface‐enhanced Raman scattering (SERS) tags for the measurement of biomolec…
A zinc(II)phtalocyanine-tin(IV)porphyrin dyad with a strong electronic coupling was synthesized and upon light excitation shown to exhibit ultra-fast, long-range electron transfer in a single step.
We have developed a device fabrication process to pattern graphene into nanostructures of arbitrary shape and control their electronic properties using local electrostatic gates. Electronic transport measurements have been used to characterize locally gated bipolar graphene p-n-p junctions. We observe a series of frac…
Nanostructured materials provide a promising platform for early cancer detection and treatment. Here we highlight recent advances in the synthesis and use of Au nanocages for such biomedical applications. Gold nanocages represent a novel class of nanostructures, which can be prepared via a remarkably simple route base…
Folate-conjugated gold nanorods targeted to tumor cell surfaces produced severe membrane damage upon near-infrared irradiation. Photoinduced injury to the plasma membrane resulted in a rapid increase in intracellular calcium (shown in green) with subsequent disruption of the actin network, featured prominently by the…
A dopamine-PEG based ligand is synthesized and used to stabilize monodisperse 9 nm Fe3O4 nanoparticles in physiological conditions and against non-specific uptake by macrophage cells. Such stable nanoparticles can be used to enhance the efficiency in target-specific drug delivery and to increase the signal-to-noise ra…
We report an analysis of the change in character of the fluid-to-solid transition in a quasi-two-dimensional hard-sphere colloid system as the confining wall separation changes from one to two hard-sphere diameters. Our analysis is based on a study of the bifurcation of solutions of the integral equation for the singl…
From the formation of crystalline materials from their melts is at the heat of many important industrial processes. A rigorous and comprehensive understanding of the crystallization process, however, is still lacking, and its experimental and theoretical investigation has remained a considerable challenge. We studied…