CHEMISTRY OF MATERIALS
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2020
·
IF 9.567
Stephen V. Kershaw,Wai Kin Yiu,Aleksandr Sergeev,Andrey L. Rogach
Most successful syntheses of long-wavelength infrared (IR)-absorbing/emitting Hg-chalcogenide quantum dots (QDs) use either aqueous- or organic-solvent-based methods. Accounts of IR QD growth in aprotic solvents such as dimethyl sulfoxide (DMSO) or dimethylformamide (DMF) are much less common, and yet, producing QDs in such solvents can be useful from the perspective of further reactions to conjugate or incorporate the QDs with other materials since such solvents can be a useful meeting ground for both organic and ionic solutes. Here, we start by demonstrating long-wavelength infrared emission (across the wide spectral range of up to 4500 nm) in HgTe QDs grown in DMF under basic conditions. While many existing synthetic approaches use soluble chalcogen precursors in adduct, salt, or organo-chalcogenide forms, we have opted to take the approach of using slow addition of gaseous H2Te generated under programmed control, which allowed us to investigate the growth kinetics to manipulate the different competing processes and to obtain larger HgTe QDs with the best size distributions on a repeatable and controlled basis. We demonstrate how the nucleation process of HgTe QDs can be carried out analogously to the way that it occurs in classic hot injection syntheses but in our case at a far lower (subambient) temperature, owing to the use of a much more labile Te precursor. We also demonstrate the use of a two-stage, seeded QD growth process, which allows the synthesis conditions for the initial nucleation step and the subsequent enlargement stage to be decoupled; in other words, the QD concentration during the enlargement phase need not be forced to be excessively large by the choice of nucleation conditions. This approach should eventually be extendable to making >5000 nm emitting HgTe QD-based materials, and the use of aprotic solvents will offer compatibility with other nanomaterial chemistries, e.g., oxide glass formers, etc., for the synthesis of composites. By comparing the emission spectra of HgTe QDs grown in DMF with the spectra of those grown in DMSO, we show that polaron-mediated coupling to ligands and solvents, previously seen when using DMSO, can be substantially suppressed using our new synthetic method.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
STAR Protocols
·
2025
·
IF 1.3
Yulei Zhang,Sijie Pian,Zhuning Wang,Yaoguang Ma
Summary Passive thermal management of an object can be achieved by manipulating its optical spectrum. Here, we present a protocol to create a dual-mode Janus fabric (DMJF) with unique switchable thermal management properties. We describe steps for fabricating radiative cooling (RC), ultraviolet (UV) reflective, and long-wave infrared (LWIR) shielding layers. We then detail steps for optical characterization and permeability and thermal measurements for the fabricated samples. This protocol could be applicable to various dynamic passive thermal management scenarios under diverse climatic conditions. For complete details on the use and execution of this protocol, please refer to Pian et al. 1
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Suhui Wang,Xu Zhang,Tengxiao Guo,Shuya Cao
Quantum dot (QD) passive filters present a simple and low-cost strategy for the micromation of spectrometers. In this field, the consistency between ultranarrow band gap QD fabrication and the precise control of its absorption characteristics is the key-challenge to extend QD spectrometers into the long-wave infrared (LWIR) region. Here, we show the model-based, practically precise fabrication of HgSe QDs as well as their specific spectral responses. Both the theoretical and experimental models of the HgSe QDs r–λ are formulated, which reveals the variation of transmission spectrum with the size of HgSe QDs. Then, the HgSe QDs synthesis parameter–spectral response hyperplane model and neural network model were obtained by using traditional polynomial fitting and machine learning, respectively. We also demonstrate the model-based precise fabrication of HgSe QDs with transmission characteristic peaks within 14 μm. The further simulation also shows that the 255─element QD filter array has the signal-to-noise ratio up to 14.57 dB with detection resolution about 5 cm–1.
研究领域:
材料科学
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光学工程
·
机器学习
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Suhui Wang,Yi Wang,Tengxiao Guo,Shuya Cao
In this work, a long-wave infrared (LWIR) quantum dot (QD) spectrometer was constructed for the first time by integrating a 255-element HgSe QD filter array with an LWIR array detector. The filter array was fabricated using a combination inkjet printing strategy with eight types of T-dodecyl mercaptan-terminated HgSe QD inks. The stability and morphology of the QDs were improved by optimizing the purification methodology and ligand modification. Combined with the compressive-sensing-based least-squares linear regression (CS-LS) algorithm, the LWIR QD spectrometer achieved a spectral resolution of 5.4 cm–1 over a wide spectral range of 8 to 14 μm, enabling the detection of the chemical warfare agent simulant dimethyl methylphosphonate. This technology is expected to facilitate the development of smaller volumes and more accurate identification of various targets in the future. This paper offers an approach to fabricating low-cost LWIR spectrometers and promoting the scale-up applications of QD devices.
研究领域:
光学
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材料科学
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光谱学
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化学传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xue Mei,Tong Wang,Yu Zhang,Taoqing Huang,Min Chen,Limin Wu
Passive daytime radiative cooling (PDRC) is a ground-breaking strategy to realize subambient cooling without any extra energy and environmental pollution. However, the challenge is how to work out the contradiction between thick films (typically 300–800 μm) for efficient cooling and thin films for practicality. Herein, we propose a scalable bilayer thin PDRC coating consisting of waterborne polyurethane / hollow glass beads top layer and poly(vinylidene fluoride-co-hexafluoropropene) / zinc oxide nanocubes underlayer, exhibiting sufficient solar reflectance (0.92), longwave infrared emissivity (0.93) and a relatively high thermal conductivity (1.702 W m −1 K −1 ) with a thin thickness of 100 μm. Real-time temperature detection demonstrated a subambient cooling of 8.1 °C and an above-ambient cooling of 18.1 °C compared with traditional coating under intense solar irradiation (∼883 W m −2 ). Such thin PDRC coatings with enhanced thermal dissipation can bring vast opportunities for sustainable applications, and offer an alternative pathway toward achieving effective thermal management.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
Advanced Fiber Materials
·
2023
·Vol. 5
·期 4
·1367-1377
·
IF 16.1
Yang Zhangbin,Chen Tingting,Tang Xinpeng,Xu Feiyue,Zhang Jun
Intense heat waves pose a serious threat to public health and well-being, especially in outdoor spaces. Outdoor high-temperature environments without air conditioners are major challenges for humanity. However, an achievable approach that can provide outdoor cooling without consuming any energy is lacking. Hence, this work presents a novel hierarchical fabric emitter (HFET) used for sunshade sheds to provide radiative outdoor cooling for humanity, the HFET is composed of polyethylene/silicon dioxide/silicon nitride film, melt-blown polypropylene film, and polydimethylsiloxane film from top to bottom. In addition to reflecting 94% solar irradiance by its top surface, the HFET shows selective emission (0.82 in the atmospheric window and 0.38 outside the atmospheric window) on its top surface to outer space and broadband absorption (0.80 in the longwave infrared band) on its bottom surface from the inside. This bidirectional asymmetric emission enables the simulated skin to avoid overheating by 2–11 °C relative to the reverse HFET and bare cases under direct sunlight. Due to its excellent cooling capability, the HFET will be one of the most considerable solutions for outdoor cooling in hot summer environments. Graphical Abstract
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
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2024
·
IF 6.1
Feng Xu,Xiang Xu,Bingxuan Li,Ge Zhang,Chan Zheng,Jindong Chen,Ning Ye
Long-wave infrared (IR) nonlinear optical (NLO) crystals hold great promise for extensive applications. However, IR NLO crystals with outstanding comprehensive optical and NLO performances are still in great demand. Herein, two Hg-based chalcogenides, Hg3AsS4Cl and Hg3AsS4Br, are synthesized via a chemical vapor transport technique. Attributed to the synergistic combination of [HgS3] groups and structurally aligned [AsS3] groups with lone pair electrons, the two compounds exhibit superior NLO performance, encompassing strong second-harmonic generation (SHG) effects, tremendous birefringence, and a broad transparency range, positioning them as promising long-wave IR NLO materials. Moreover, the luminescent performances of the two compounds are also investigated, revealing interesting ultraviolet (UV) region luminescence emissions, broad emission bands, and large Stokes shifts for potential luminescent applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2020
·
IF 3.085
Haining Ji,Dongqing Liu,Haifeng Cheng
Vanadium dioxide (VO 2 ) is a remarkable thermochromic material for application in adaptive infrared camouflage due to the reversible phase transition that is coupled with an abrupt change in infrared optical properties . However, the relatively high phase transition temperature and the unclear infrared optical modulation characteristics in the mid-infrared and far-infrared regions largely restrict its practical applications. Here, W-doped VO 2 nanoparticles were successfully prepared to reduce the transition temperature. When the effective doping amount of W was 1.70%, the transition temperature decreased to 43.2 °C. Importantly, the infrared properties of W-doped VO 2 nanoparticles were studied in both MWIR (3–5 μm) and LWIR (8–14 μm) thermal atmospheric windows, for the first time, which exhibited significant infrared optical changes, with emissivity variation of Δε = 0.17 and Δε = 0.28, respectively. These favorable results further promote the development of the adaptive camouflage.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
Advanced Composites and Hybrid Materials
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2022
·Vol. 5
·期 3
·1966-1975
·
IF 11.806
Zhu Huijie,Wang Yajie,Qu Muchao,Pan Yamin,Zheng Guoqiang,Dai Kun,Huang Mina,Alhadhrami A.,Ibrahim Mohamed M.,El-Bahy Zeinhom M.,Liu Chuntai,Shen Changyu,Liu Xianhu
Daytime radiative cooling materials have recently attracted tremendous interest by reflecting sunlight and radiating heat to the ultracold outer space without any energy consumption. While some progress has been made, it remains a big challenge in fabricating highly efficient, low-cost, biodegradable, and sustainable all-day radiative coolers. Here, we report a hierarchically structured poly(vinyl alcohol)/silica film via a facile electrospinning method. The diameters of the electrospun fibers range from several nanometers to several microns, and the silica particles distribute across the surface randomly. The optimal film exhibits sufficiently high solar reflectance (97%) and superior longwave infrared thermal emittance (95%), thus realizing sub-ambient cooling of ~ 9.3 °C during the night and ~ 4.5 to ~ 7.5 °C during the midday under the solar intensity of ~ 700 W/m 2 . Overall, this film demonstrates high performance of daytime radiative cooling, with an inexpensive and environmental production way compared to those of state-of-the-art designs. Graphical abstract
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Yu Zeng,Yong Liu,Tengyao Jiang,Fangyuan Zhao,Likun Wang,Sainan Ma,Guojian Yang,Sijia Han,Guoqiao Lai,Gang Tan,Gaorong Han
Intelligent modulation of solar and thermal radiation for a smart window, including visible, near-infrared (NIR), and long-wave infrared (LWIR) spectral tri-bands (0.38–25 µm), to achieve indoor comfort and energy efficiency is a critical frontier in sustainable building design. However, independent regulations of multi-functional radiation of visible lighting, NIR heating, and LWIR radiative cooling for dynamic operational requirements and weather conditions are not fully solved. A PET/ITO/PB/Pt-NPs electrode featuring separated reactions of ion insertion and metal electrodeposition for dual-band modulation of visible and NIR via precise potential control, enabling multifunctionalities such as illumination, glare reduction, and privacy protection is proposed. A multimodal smart window of lighting-heating-emitting electro-modulation device (LHE-ED), wherein electrochromism and dynamic emittance are delicately manipulated for tri-band modulation, possesses six independent electro-driven states of multi-scene lighting-heating-emitting regulations for the first time, exhibiting excellent wavelength selectivity of △ T Vis = 41.24%, △ T NIR = 53.95%, and Δ ε 8-13 µm = 0.35. Building energy simulations demonstrate the LHE-ED outperforms commercial low-E glass across diverse climate zones, showcasing a maximum reduction in CO 2 emissions of 34.01 kg (m 2 year) −1 and a decrease in heating, ventilation and air conditioning (HVAC) energy consumption by 34.18% annually, which paves the way for next-generation smart window in terms of energy saving and environmental preservation.
研究领域:
材料科学
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光学工程
·
建筑技术
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能效
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Rong Zhang,Renzhi Li,Peng Xu,Wenhuan Zhong,Yifan Zhang,Zhenyang Luo,Bo Xiang
Being a major impediment, the development of advanced smart windows with exceptional thermoregulation in both the visible-near infrared (Vis-NIR) and the long-wave infrared remains a significant aspiration to scholars. Herein, an innovative strategy was implemented to achieve self-adaptive smart window that seamlessly integrates the thermochromic and radiative cooling technologies (TRSW), and holds great potential in effectively addressing the intricate thermal radiation requirements arising from unpredictable climatic conditions. The TRSW demonstrated an impressive capacity to regulate solar energy through automatic modulation of emissivity (ε) at both high (ε LWIR-H = 0.68) and low (ε LWIR-L = 0.35) temperatures, while effectively maintaining Vis-NIR regulation (20.12%). Moreover, the results of TRSW’s outdoor performance exhibited its efficiency in implementing dual solar energy transmission modes, effectively inhibiting the Vis-NIR transmission to mitigate solar overheating in high-temperature conditions, while diminishing heat dissipation and promoting radiative cooling in low-temperature situations. Compared to conventional cooling materials, the dynamic emissivity modulation of TRSW provided an effective approach to prevent overcooling at lower temperatures. Consequently, TRSW fostered an efficient synergy between the solar transmittance modulation (ΔT sol ) and Δε, which led to heightened modulation of the entire spectrum and facilitated exceptional thermal management. This work paves an intriguing prospect of developing advanced smart windows with remarkable thermoregulation and promises a wide range of thermal regulation applications, such as windows, roofs, walls, and advanced textiles.
研究领域:
材料科学
·
能源工程
·
环境科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Photonics
·
2023
·
IF 7
Yu Zhang,Tong Wang,Xue Mei,Min Chen,Limin Wu
Constructing porous polymer films for passive radiative cooling has proved an efficient way to dissipate heat to cold outer space in the form of thermal radiation and concurrently reflect incident sunlight without additional energy input. Nevertheless, most researches focus on randomly distributed pores, which cannot precisely control the pore arrangement and size and may restrict the optical properties. Herein, an ordered porous poly(methyl methacrylate) (PMMA) film comprising three-dimensional (3D) ordered micropores and highly interconnected nanopores is presented via a sacrificial template method. It exhibits prominent solar reflectance (0.94), long-wave infrared (LWIR) thermal emissivity (0.95), and low thermal conductivity (0.044 W m–1 K–1). The ordered porous PMMA film can achieve a sub-ambient temperature drop of up to 10.6 °C during midday under an average solar irradiance intensity of ∼829 W m–2 and promisingly realize a maximum daytime cooling power of ∼75.6 W m–2. This work will significantly influence the design of porous structural radiative cooler and is conducive to understanding the underlying relationship between pore arrangement, pore size, and optical/thermal performance, facilitating the development of high-performance passive daytime radiative cooling porous polymer films.
研究领域:
材料科学
·
辐射冷却
·
聚合物工程
·
能源效率
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）