Phys.org March 18, 2024 Metal nanoclusters have emerged as NIR–emissive materials, but their room-temperature photoluminescence quantum yield (PLQY), especially in solution, is often low. Researchers in China studied the photophysics of Au22(tBuPhC≡C)18 (Au22) and its alloy counterpart Au16Cu6(tBuPhC≡C)18 (Au16Cu6) (where tBu is tert-butyl and Ph is phenyl) and found that copper doping suppressed the nonradiative decay and promoted intersystem crossing rate ~300-fold higher. According to the researchers their approach could enable the development of highly emissive metal cluster materials… read more. TECHNICAL ARTICLE
Tag Archives: S&T China
China promises more money for science in 2024
Nature March 8, 2024 At its annual meeting this week, China’s legislative body, the National People’s Congress, promised to increase government funding for science by 10% in 2024. It’s the largest boost to funding in five years. The increase comes as the Chinese economy struggles to meet growth targets and is locked in a race for technological supremacy with the United States. “To win this game, China has to invest in science and technology, especially in basic research,” says Marina Zhang, who studies innovation with a focus on China… read more.
Novel method improves Fourier transform infrared spectroscopy detection of ultra-low concentration trace substances
Phys.org March 7, 2024 High-resolution solar spectra play a crucial role in research pertaining to atmospheric vertical profiles and analysis of atmospheric composition. However, the improvement of spectral resolution is subject to certain limitations due to hardware constraints. Researchers in China proposed multi-step linear prediction (MSLP) method based on sliding windows to enhance the spectral resolution of passive remote sensing FTIR spectra, thereby improving the accuracy and reliability of atmospheric composition analysis. Their method improved the spectral resolution of passive remote sensing FTIR spectra. In simulations, the MSLP method significantly enhanced the spectral resolution of passive remote sensing FTIR spectra. […]
Designing a drone that uses adaptive invisibility: Towards autonomous sea-land-air cloaks
Phys.org March 6, 2024 An omnidirectional flying cloak has not been achieved so far, primarily due to the challenges associated with dynamic synthesis of metasurface dispersion. Researchers in China have demonstrated an autonomous aero amphibious invisibility cloak that incorporated a suite of perception, decision, and execution modules, capable of maintaining invisibility amidst kaleidoscopic backgrounds and neutralizing external stimuli… read more. Open Access TECHNICAL ARTICLE
Research team develops a wireless sensor for spotting chemical warfare agents
Phys.org March 5, 2024 Researchers in China developed a 433 MHz passive wireless surface acoustic wave (WSAW) gas sensor for dimethyl methyl phosphonate (DMMP) detection. It includes a YZ lithium niobate (LiNbO3) substrate with metallic interdigital transducers (IDTs) etched on it, and an antenna was placed near the IDT… read more. Open Access TECHNICAL ARTICLE
Charting the course to eco-friendly steel: China’s blueprint for cleaner air and a cooler planet
Phys.org February 7, 2024 Researchers in China described their integrated emission inventory that included air pollutants and CO2 emissions from 811 ISI enterprises and five key manufacturing processes in 2020. According to them sintering was the primary source of air pollution in the ISI. 81% of total CO2 emissions come from blast furnaces. Contributions of ISI have resulted in an increase in national population weighted PM2.5 concentration, causing approximately 59,035 premature deaths in 2020. Emissions from other provinces contributed to 48% of PM2.5-related deaths in China. According to them it is crucial for ISI manufacturers to prioritize the removal of […]
China conducts first nationwide review of retractions and research misconduct
Nature February 12, 2024 A Nature analysis reveals that since 2021 there have been more than 17,000 retractions with Chinese co-authors. The [Chinese] government launched the nationwide self-review in response to Hindawi, a London-based subsidiary of the publisher Wiley, retracting many papers by Chinese authors. A Nature analysis shows that last year, Hindawi issued more than 9,600 retractions, of which the vast majority — about 8,200 — had a co-author in China. Nearly 14,000 retraction notices, of which some three-quarters involved a Chinese co-author, were issued by all publishers in 2023. According to Nature’s analysis, which includes only English-language journals, […]
Scientists Slowed Down Light by 10,000 Times in an Experiment
Science Alert February 11, 2024 The metasurface analogue of electromagnetically induced transparency (EIT) provides a chip-scale platform for achieving light delay and storage, high Q factors, and greatly enhanced optical fields. Researchers in China developed a new approach for realizing collective EIT-like bands with a measured Q factor reaching 2750 in silicon metasurfaces in the near-infrared regime. It employed the coupling between two collective resonances, the Mie electric dipole surface lattice resonance (SLR) and the out-of-plane/in-plane electric quadrupole SLR (EQ-SLR). The collective EIT-like resonance could have diverging Q factor and group delay due to the bound state in the continuum […]
Nano weaving creates ‘Chinese knot’ magnetism for powerful microwave shielding
Nanowerk February 7, 2024 Harnessing tailored nanoscale magnetic materials like metal-organic frameworks for advanced applications has faced two key challenges – reliably constructing these frameworks with specific and programmable architectural arrangements and effectively characterizing these nanostructures. Researchers in China strategically dispersed magnetic Co nanoparticles into a meticulously layered nanoporous framework with the bottom and upper nanopores exhibiting a staggered arrangement. The staggered nanoporous structure intricately shapes the magnetic flux lines into a Chinese knot shape, significantly altering its magnetic characteristics. Such a transformation remarkably enhances the material’s efficacy in absorbing electromagnetic waves, covering the Ku band even at a minimal […]
Whole-infrared-band camouflage with dual-band radiative heat dissipation
Phys.org February 7, 2024 Achieving effective camouflage and thermal management across the entire infrared spectrum, especially the short-wave infrared (SWIR) band, remains challenging. Researchers in China proposed a multilayer wavelength-selective emitter that achieves effective camouflage across the entire infrared spectrum, including the near-infrared (NIR), SWIR, mid-wave infrared (MWIR), and long-wave infrared (LWIR) bands, as well as the visible (VIS) band. The emitter would enable radiative heat dissipation in two non-atmospheric windows. The emitter’s properties were characterized by low emittance in the SWIR/MWIR/LWIR bands, and low reflectance in the VIS/NIR bands. The high emittance in the two non-atmospheric windows would ensure […]