Articles tagged with Quantum Dots
Researchers at the National Physical Laboratory have created an electron pump nano-device that can manipulate individual electrons to create a well-defined electrical current. The device achieves this by speeding up the rate of pumping electrons while maintaining accuracy, surpassing previous records.
Researchers track serotonin regulation at a new level of detail using tiny fluorescent beads, shedding light on the dynamics of neurotransmitter transport. The study reveals two distinct populations of serotonin transporters, controlled by different regulatory pathways.
A groundbreaking study found quantum dots to be safe in primates over a one-year period, with no signs of illness or toxicity. The results suggest that medical applications such as image-guided surgery and diagnostic tests could be viable with careful use.
Researchers have successfully boosted the fluorescent efficiency of ultra-small quantum dots to as high as 45%, making them suitable for special lighting applications. This improvement translates to a higher luminous efficiency of about 40 lumens/watt, outperforming existing LEDs and incandescent bulbs.
A new prototype technology demonstrates all three primary laser colors coming from one material. This breakthrough could lead to making products such as high-performance digital displays that employ a variety of laser colors.
Physicists have devised a new method to handle vibrations' effect on electron transport, improving qubit information transfer. The model simulates closer control over phonons and electrons, enabling stronger coupling regimes.
NIST researchers studied the self-assembly of quantum dots using DNA origami, determining critical factors and error rates. They found that simple structures take up to 24 hours to assemble with an error rate of about 5 percent.
Researchers at the University of Washington have developed a new method to stimulate neurons in the brain using quantum dots. This technique allows for precise control over cell activity and could provide insights into disease processes and potential treatments for conditions like Parkinson's disease, Alzheimer's, and severe depression.
Researchers at University at Buffalo have successfully embedded charged quantum dots into photovoltaic cells to increase their electrical output. This technology allows solar panels to harvest infrared light, leading to a significant boost in efficiency.
Paul Alivisatos, Berkeley Lab director, has won the Wolf Prize in Chemistry for his pioneering work on nanochemistry and artificial nanostructures. He shares the award with Charles Lieber of Harvard University, both recognized authorities on nanoscience and quantum dot technology.
Harvard researchers develop a single-layer quantum-dot light-emitting device (QD-LED) that enables more effective control over electrical current flow and allows for diverse applications. The new architecture uses an insulating egg-crate structure to optimize the device's performance.
Researchers from Delft University of Technology have demonstrated that mobile electrons can be produced by a single light particle in quantum dot films, increasing solar cell efficiency. Up to 3.5 free electrons are created per absorbed light particle, surviving long enough to move freely through the material.
Researchers at Delft University of Technology have developed a cheap and efficient quantum dot solar cell by understanding electron movement in linked semiconductor nanoparticles. The discovery was published on Nature Nanotechnology, paving the way for more sustainable energy solutions.
Researchers from U of T, KAUST, and Penn State created the most efficient solar cell using collodial-quatum-dots (CQD), achieving record electrical currents and power conversion efficiency. The team's innovative approach eliminated charge traps, enabling rapid electron movement and providing a path to long-term stability.
Researchers at the University of Florida have developed a novel manufacturing process for quantum dot-based LEDs, reducing production costs and improving efficiency. The breakthrough enables the large-scale commercialization of these energy-efficient lights, potentially replacing traditional incandescent and fluorescent bulbs.
Researchers found temperature differences of a few degrees Fahrenheit between parts of individual cells, which may impact health and disease. The study suggests that cells use differences in temperature to communicate, leading to potential new insights into biological mechanisms.
A University at Buffalo study found that quantum dots degrade in soil, releasing toxic cadmium and selenium ions. The researchers suggest that modifying the chemistry of nanomaterials could prevent degradation and mitigate environmental impacts.
Researchers propose that quantum dots with opposing spin electrons can create a peculiar form of magnetism. This phenomenon occurs due to the 'tug-of-war' between the mobile electrons and the manganese atoms in the quantum dot. The resulting magnetic message can align spins, causing the quantum dot to be magnetic.
Researchers at UCL have demonstrated the first electrically driven quantum dot laser grown directly on a silicon substrate with a suitable wavelength for telecommunications. This breakthrough enables efficient light sources in silicon, a crucial material for future silicon photonics.
Researchers develop surface-based assembly method to produce promising power sources with controlled electron transfer rates. By varying particle size and linker length, they enhance electron transfer rate and suppress fluctuations, leading to stable charge generation.
Researchers at Berkeley Lab have demonstrated localized surface plasmon resonances in doped semiconductor quantum dots, opening up possibilities for plasmonic sensing and manipulation of solid-state processes. This discovery extends the range of candidate materials for plasmonics to include semiconductors, offering advantages such as d...
Researchers have invented fluorescent nano-particles that can continuously change colors to track molecules under a microscope. The color-changing particles, made with quantum dots, can be tailored to tag specific molecules and provide insights into biological processes.
Researchers have discovered that smaller quantum dots can increase the efficiency of solar panels by generating multiple excitons from a single photon of light. This breakthrough has significant implications for commercial realizations of multiple-exciton generation (MEG) technology.
Researchers have successfully performed energy-state occupancy readouts of artificial atoms using common computer interfaces, enabling the creation of quantum mechanical charge carriers. This breakthrough brings the technology one step closer to practical applications.
Researchers found that adding an organic molecule layer can increase quantum dot solar cell efficiency three-fold. The layer helps keep electrons apart, preventing recombination and increasing electrical charge production.
Dr. Strauf's research focuses on scalability of semiconductor quantum photonic devices, which could enable novel applications in quantum communication, lithography, and national security. His award will support his work at Stevens and Brookhaven National Lab, as well as graduate student researchers.
Researchers at the University at Buffalo have developed a technology using quantum dots that can deliver a cancer drug specifically to lung cells without causing inflammation, increasing drug uptake and reducing side effects. The study shows promise for treating tuberculosis and other inflammatory lung diseases.
Researchers have discovered a short-range scattering mechanism in type-II GaSb/GaAs quantum dots, which may lead to more efficient transport of electrons and improved performance in quantum dot-based devices. This breakthrough has significant implications for the future design of novel quantum devices.
University of Illinois researchers have created a tiny needle that can deliver quantum dots directly into a cell's nucleus, allowing for the study of internal environments and cellular processes. This breakthrough technique uses electrical potential to control the release of molecules and offers precise monitoring capabilities, opening...
Researchers at North Carolina State University developed tiny microneedles that can deliver quantum dots, nanoscale crystals, into the skin for diagnosing and treating various medical conditions. The technology uses multiphoton microscopy to visualize quantum dot delivery, paving the way for more rapid cancer diagnosis and treatment.
Researchers at McGill University have discovered a way to control the piezoelectric effect in nanoscale semiconductors called quantum dots. This enables the development of incredibly tiny new products with potential applications in solar power and nanoelectronic devices.
Scientists at University of Toronto have developed a new inexpensive solar cell design that uses nickel instead of gold, reducing material costs by 40-80 percent. The design employs low-cost electrical contacts, including nickel, to gather the electrical current produced by colloidal quantum dot solar cells.
Researchers developed multicolor quantum dot staining to identify Reed-Sternberg cells, characteristic of Hodgkin's lymphoma. This method allows for rapid detection and identification of rare malignant cells from heterogeneous tissue specimens.
Scientists have discovered a method to capture higher energy sunlight lost as heat in conventional solar cells, potentially increasing efficiency to over 66%. Quantum dots made of lead selenide have been found to transfer hot electrons to an electron conductor, enabling the capture of this energy.
Researchers introduced quantum dots into fully epitaxial nitride laser structures, eliminating the need for hybrid systems. This advancement paves the way to further optimization of lasers and single photon emitters in the visible spectrum region.
Researchers at Rice University have discovered a way to extract hydrogen atoms from graphane, creating spaces that resemble quantum dots. This breakthrough enables precise control over the semiconducting properties of quantum dots, with potential applications in advanced optics, single-molecule sensing, and nanoscale circuitry.
Researchers at Rensselaer Polytechnic Institute have developed a nanotechnology-based 'microlens' that enhances infrared imaging signal without increasing noise. The gold-covered lens-less structure doubles the detectivity of a quantum dot-based infrared detector and has the potential to boost it by up to 20 times.
DNA-repair proteins efficiently scan the genome for errors by jumping and sliding between DNA molecules, with paused motion representing complexes checking for structural abnormalities. The study reveals an important mechanism for maintaining genomic integrity.
Physicists at the Joint Quantum Institute have developed a technique to create entangled photons from quantum dots tweaked with a laser. This method may enable more compact and convenient sources of entangled photon pairs than presently available, revolutionizing quantum information applications.
Researchers created the first atomic-scale maps of quantum dots, providing detailed information about their structure and chemical makeup. This breakthrough enables controlled fabrication and manipulation of quantum dots for various applications in computing, energy and technology.
Scientists develop a novel nanoparticle structure that combines the functions of quantum dots and gold nanoparticles, creating a multipurpose tool for medical imaging and therapy. The breakthrough could enable more efficient delivery of drugs, heat therapy, and optical imaging.
Researchers at the University of Michigan have discovered a method to prolong quantum bit memory by utilizing lasers. By exciting the quantum dot with a laser, scientists were able to block magnetic field interactions and stabilize the magnetic field, resulting in a significant increase in stable existence of the quantum bit.
Scientists successfully capture a single electron in a highly tunable carbon nanotube double quantum dot using ultraclean nanotubes. They also discovered a new type of tunneling analogous to Klein paradox, allowing electrons to pass through obstacles without sufficient energy.
Researchers at the Institute of Bioengineering and Nanotechnology have synthesized gold nanoclusters that can be used for sub-cellular biolabeling and bioimaging. These clusters are suitable for use within the body due to their lack of toxic metals, enabling scientists to monitor cell nucleus dynamics and study genomic changes.
Researchers discovered a parasitic effect when powering quantum dot amplifiers and were able to overcome it, leading to the most efficient amplifier ever measured. This breakthrough has enormous potential significance for laser technology, telecommunications, and optical computing applications.
A team of researchers from the University of Warwick has discovered a way to use doughnut-shaped quantum dots to slow and freeze light, paving the way for more efficient and effective light-based computing. This technique has significant implications for the development of 'slow glass' that can re-release photons in sequence.
Researchers developed an imaging technique that can reveal the atomic structure of nanocrystals with a resolution of less than one angstrom. The technique combines images and diffraction patterns taken with the same electron microscope, allowing for accurate determination of atomic structures.
Researchers have successfully created single-atom quantum dots that can be used to control individual electrons with minimal energy. This breakthrough brings quantum dot-based devices within reach, potentially transforming the development of ultra-low power computers.
Scientists at Emory University have developed strain-tuned quantum dots with new optical properties, reducing toxicity and size limitations. These particles can be made mostly of zinc and selenium, emitting light at near-infrared wavelengths, which could improve biomedical imaging and optoelectronics.
Researchers at NIST and JQI have developed a technique to fine-tune light from quantum dots using laser pairs, potentially improving entangled photon generation for quantum information technologies. This breakthrough could accelerate advanced cryptography applications and pave the way for compact quantum dot devices.
Researchers have developed a novel method to kill tumor cells using nanoparticles and light. The technique employs quantum dots that emit light when exposed to megavoltage x-rays, which triggers the cancer-killing activity of Photofrin. This approach could be more effective in treating deeply seated tumors than current methods.
Researchers at North Carolina State University found that quantum dots can penetrate rat skin if there is an abrasion, providing insight into potential workplace concerns. The study shows that even minor cuts or scratches could allow these nanoparticles to penetrate deep into the viable dermal layer and potentially reach the bloodstream.
Scientists have successfully used quantum dots to deliver gene-silencing tools (siRNA) into cells, achieving 2% protein production compared to 13-51% with existing methods. The new approach is also five-to-ten times less toxic to cells.
Researchers at NIST have developed a microwave-assisted two-stage process to produce water-soluble quantum dots with improved stability and brightness. The new method avoids a problematic step in conventional approaches, resulting in higher-quality dots.
New research from ACS Nano explores innovative applications of nanotechnology, such as increasing power conversion efficiencies in solar cells and targeting nanoparticles for gene delivery. The journal also discusses rapid toxicity evaluation methods and the use of nanotubes with nanomotors to enhance speed.
A new study by the National Institute of Standards and Technology (NIST) investigated the dietary accumulation, elimination, and toxicity of fluorescent quantum dots in a simplified food chain. The researchers found that while the nanomaterials were transferred across the food chain, they did not accumulate in higher organisms.
Researchers have developed a new nanocomposite material that outperforms individual components, offering enhanced solar cell efficiency and potential applications in energy technologies.
Researchers at NRL and universities developed a new optical technique to control electron spins in quantum dot ensembles, enabling coherent manipulation of all spin frequencies. This breakthrough aims to create novel quantum computing devices using solid-state technology.
The NIST device can accurately count 1, 2 or 3 photons at least 83 percent of the time, a capability essential for advanced precision optical metrology. The detector has an internal quantum efficiency of 68 ± 18 percent and potential to operate at higher temperatures than other single-photon detectors.
Researchers from Argonne National Laboratory have developed a method to characterize quantum dot blinking on faster time scales than before. The results provide new insight into the mechanism of quantum-dot blinking and may help control and suppress this flickering behavior.