We describe a film of highly-aligned single-walled carbon nanotubes that acts as an excellent terahertz linear polarizer. There is virtually no attenuation (strong absorption) when the polarization perpendicular (parallel) to nanotube axis. From data we calculated reduced dichrosim be 3, corresponding nematic order parameter 1, which demonstrates nearly perfect alignment well intrinsically anisotropic response in film.

We compare the absorption, photoluminescence, and magneto-optical properties of colloidal CuInS2 (CIS) nanocrystals with two closely related well-understood binary analogs: Cu-doped ZnSe CdSe nanocrystals. In contrast conventional CdSe, both CIS exhibit a substantial energy separation between emission absorption peaks (Stokes shift) marked asymmetry in polarization-resolved low-temperature magneto-photoluminescence, which point to role localized dopant/defect states forbidden gap....

We have used resonant Raman scattering spectroscopy to fully analyze the relative abundances of different (n,m) species in single-walled carbon nanotube samples that are metallically enriched by density gradient ultracentrifugation. Strikingly, data clearly show our ultracentrifugation process enriches metallic fractions armchair and near-armchair species. observe nanotubes constitute more than 50% each (2n + m) family.

In semiconductors, quantum confinement can greatly enhance the interaction between band carriers (electrons and holes) dopant atoms. One manifestation of this enhancement is increased stability exciton magnetic polarons in magnetically doped nanostructures. limit very strong 0D that realized colloidal semiconductor nanocrystals, a single exert an effective exchange field Bex on embedded dopants exceeds several tesla. Here we use sensitive method resonant photoluminescence (PL) to directly...

We describe a study of the magneto-optical properties Ag+-doped CdSe colloidal nanoplatelets (NPLs) that were grown using novel doping technique. In this work, we used magnetic circularly polarized luminescence and circular dichroism spectroscopy to light-induced magnetism for first time in 2D solution-processed structures doped with nominally nonmagnetic Ag+ impurities. The excitonic polarization (PX) exciton Zeeman splitting (ΔEZ) recorded as function field (B) temperature (T). Both ΔEZ PX...

The appearance of a broad Raman peak at $\ensuremath{\sim}$1550 cm${}^{\ensuremath{-}1}$ (${G}^{\ensuremath{-}}$ peak) in carbon nanotubes has been conventionally attributed to the presence metallic nanotubes. Here, we present wavelength-dependent resonant measurements on macroscopic nanotube ensembles enriched armchair species prepared via density gradient ultracentrifugation. Our data clearly show that ${G}^{\ensuremath{-}}$ mode is absent for structures and appears only when excitation...

We use terahertz pulses to induce resonant transitions between the eigenstates of optically generated exciton populations in a high-quality semiconductor quantum-well sample. Monitoring excitonic photoluminescence, we observe transient quenching $1s$ emission, which attribute terahertz-induced $1s$-to-$2p$ excitation. Simultaneously, pronounced enhancement $2s$-exciton emission is observed, despite $1s$-to-$2s$ transition being dipole forbidden. A microscopic many-body theory explains...

We report the synthesis of ultrathin silver sulfide (Ag2S) nanoplatelets (NPLs) synthesized via a one-pot method in ethylene glycol with 3-mercaptopropionic acid serving as both sulfur precursor and platelet ligand. The colloidally are exceptionally thin, thickness only 3.5 ± 0.2 Å 1S exciton Bohr diameter to confinement ratio ∼12.6. NPL growth is shown be quantized by layer using absorption photoluminescence (PL) spectroscopy. Transmission electron microscopy, atomic force X-ray diffraction...

Over the past decade, substantial progress has been made in chemical control (chiral enrichment, length sorting, handedness selectivity, and filling substance) of single-wall carbon nanotubes (SWCNTs). Recently, it was shown that large, horizontally aligned films can be created out postprocessed SWCNT solutions. Here, we use machine-vision automation parallelization to simultaneously produce globally using pressure-driven filtration. Feedback enables filtration occur with a constant flow...

We have observed a nearly fourfold increase in the electron spin resonance (ESR) signal from an ensemble of single-walled carbon nanotubes (SWCNTs) due to oxygen desorption. By performing temperature-dependent ESR spectroscopy both before and after thermal annealing, we found that SWCNTs can be reversibly altered via molecular content samples. Independent presence adsorbed oxygen, Curie-law (spin susceptibility $\propto 1/T$) is seen $\sim$4 K 300 K, indicating probed spins are finite-level...

We have measured temperature ($T$)- and power-dependent electron spin resonance in bulk single-wall carbon nanotubes to determine both the spin-lattice spin-spin relaxation times, ${T}_{1}$ ${T}_{2}$. observe that ${T}_{1}^{\ensuremath{-}1}$ increases linearly with $T$ from 4 K 100 K, whereas ${T}_{2}^{\ensuremath{-}1}$ decreases by over a factor of two when is increased 3 300 K. interpret ${T}_{1}^{\ensuremath{-}1}\ensuremath{\propto}T$ trend as via interaction conduction electrons...

Single-wall carbon nanotubes (SWCNTs) exhibit a wide range of physical phenomena depending on their chirality. Nanotube networks typically contain broad mixture chiralities, which prevents an in-depth understanding SWCNT ensemble properties. In particular, electronic-type mixing (the simultaneous presence semiconductor and metallic nanotubes) in remains the single largest hurdle to developing comprehensive view nanotube electrical transport, critical step toward use optoelectronics. Here, we...

Abstract The recent introduction of slow vacuum filtration (SVF) technology has shown great promise for reproducibly creating high‐quality, large‐area aligned films single‐wall carbon nanotubes (SWCNTs) from solution‐based dispersions. Despite clear advantages over other SWCNT alignment techniques, SVF remains in the developmental stages due to a lack an agreed‐upon mechanism, hurdle which hinders optimization. In this work, filter membrane surface is modified show how resulting nematic...

Li, Na, K, Rb, and Cs have been intercalated into the two-dimensional (2D) van der Waals material WO2Cl2, with intercalation being reported for first time. The topochemical reaction of these alkali metals causes dramatic crystallographic, optical, electronic changes to WO2Cl2. During each metals, WO2Cl2 from a clear transparent insulating phase blue partially species finally lustrous bronze material. Upon intercalation, host undergoes significant systematic in interlayer spacing, as well 10...

Semiconducting single-walled carbon nanotubes' (SWCNTs) broad absorption range and all-carbon composition make them attractive materials for light harvesting. We report photoinduced charge transfer from both multichiral single-chirality SWCNT films into atomically flat SnO2 TiO2 crystals. Higher-energy second excitonic transitions produce more photocurrent, demonstrating carrier injection rates are competitive with fast hot-exciton relaxation processes. A logarithmic relationship exists...

Utilizing spin in condensed matter is an important means to create or enhance technologically phenomena. However, this route has rarely been used produce relevant functional advantages for the generation, detection, manipulation of light. This work shows that Seebeck effect (SSE), which a pure current generated from magnetization and thermal gradient, can detect light Pt/Y${}_{3}$Fe${}_{5}$O${}_{12}$ devices at wavelengths ultraviolet near-infrared. The extremely flat, broadband responsivity...

In this work, the authors study time- and temperature-dependence of optically induced magnetization in bulk crystals slightly oxygen-deficient SrTiO3–δ using an coupled superconducting quantum interference device magnetometer. Circularly-polarized sub-bandgap light is found to induce a weak (∼5 × 10−7 emu) but extremely long-lived (hours) magnetic moment at zero field. The utilize effect demonstrate that can be used as addressable memory by writing subsequently reading patterns with light....

We have used resonant Raman scattering spectroscopy to fully analyze the relative abundances of different (n,m) species in single-walled carbon nanotube samples that are metallically enriched by density gradient ultracentrifugation. Strikingly, data clearly show our ultracentrifugation process enriches metallic fractions armchair and near-armchair species. observe nanotubes constitute more than 50% each (2n + m) family.

Ice adhesion on aerospace-relevant materials is both complex and not well understood. Measuring such understanding the underlying physics involved require reliable testing techniques that can yield multifaceted data sets. The latter includes surface morphology, is, roughness, its spatial correlation structure, resolving substrate-induced strain, direct mechanical of adhesion. As part a continuing investigation ice relevant surface, we performed time-dependent stress ramps aluminum surfaces....

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTreatment of Pulp and Paper Mill WasteAugust S. Erspamer William D. RiceCite this: Ind. Eng. Chem. 1949, 41, 8, 1806–1809Publication Date (Print):August 1, 1949Publication History Published online1 May 2002Published inissue 1 August 1949https://pubs.acs.org/doi/10.1021/ie50476a007https://doi.org/10.1021/ie50476a007research-articleACS PublicationsRequest reuse permissionsArticle Views55Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are...

Preparation techniques for producing films of individualized solution-dispersed nanoparticles (NPs) optical spectroscopy are often technically challenging and tailored a specific NP system. In this work, we present rapid, easy, economical technique polyvinyl acetate (PVAc)-based NP-polymer on the order 100’s micrometers thick that exhibit high uniformity, low aggregation, excellent transparency, terahertz absorption. addition, find these robust at cryogenic temperatures have laser damage...