Materials
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2018
·Vol. 11
·期 5
·791
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IF 2.467
Junping Ding,Huanchun Wang,Haomin Xu,Lina Qiao,Yidong Luo,Yuanhua Lin,Cewen Nan
High efficiency photocatalyst Bi2O2(CO3)1−xSxwas synthesized conveniently with chemical bath precipitation using Bi2O2CO3as the precursor. The microstructures of the samples are systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS) and UV-Vis spectroscopy; the optical and photocatalytic properties are carefully tested as well. The content ofS, which was tuned through the controlling of the precipitation process, was verified to have an intense effect over the photocatalytic properties. A nearly saturatedSratio and the best photocatalytic performance were observed in specimens with the mostScontent. Our study reveals that, with negligible influence of the morphology and crystal structure, Bi2O2(CO3)1−xSxpossessed a broadened optical absorption regionfromultraviolet to visible light, and enhanced photocatalytic activity in comparison to precursor Bi2O2CO3in photocatalytic degradation of Congo Red aqueous solution.Keywords:Bi2O2CO3;Bi2O2(CO3)1−xSx;broadband spectra;photocatalysis
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
NANOTECHNOLOGY
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2023
·Vol. 35
·期 11
·115701
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IF 3.5
Xi Chen,Jie Liu,Xun Li,Zhiqun Cheng,Tian-Song Deng
Colloidal gold nanorods (GNRs) have demonstrated their potential to absorb light within specific wavelength bands and induce photothermal effects. However, the unpredictability and lack of adjustability in the broadband spectrum formed by the self-assembly of gold nanospheres or the coupling of various sizes of GNRs have posed significant challenges. To address this, we have developed broadband GNRs (BGNRs) with a predictable and adjustable extinction band in the visible and near-infrared regions. The BGNRs were synthesized by simply mixing GNRs with different aspect ratios, allowing for control over the bandwidths and positions of the extinction bands. Subsequently, the BGNRs were coated with silica and underwent surface modification. The resulting BGNRs@SiO2 were then mixed with either polydimethylsiloxane (PDMS) or polyvinylidene fluoride (PVDF) to create BGNRs@SiO2/PDMS (or PVDF) films. The BGNRs@SiO2/PDMS and BGNRs@SiO2/PVDF films both exhibit excellent photothermal performance properties. Additionally, the light absorption intensity of the BGNRs@SiO2/PVDF film linearly increases upon folding, leading to significantly enhanced photothermal performance after folding. This work demonstrates that plasmonic colloidal GNRs, without the need for coupling, can yield predictable and adjustable extinction bands. This finding holds great promise for future development and practical applications, particularly in the transfer of these properties to films.
研究领域:
纳米技术
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材料科学
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光学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2024
·
IF 8.3
Zhipeng Lv,Huiping Gao,Yayong Hu,Yunpeng Fan,Gencai Pan,Huafang Zhang,Wenwu You,Zhenlong Zhang,Yanli Mao
Broadband photodetectors covering ultraviolet (UV) to near-infrared (NIR) wavelengths play an essential role in communications, imaging, and biosensing. Developing a single photodetector with a broadband optical response operating at room temperature can significantly reduce the complexity and cost of receiver systems for multispectral applications. In this work, utilizing the porous structure characteristics of Cs2AgBiBr6:Sn thin films, a self-powered detector with broad spectral response (UV–vis-NIR) was achieved by constructing an effective Cs2AgBiBr6:Sn/PDPP3T heterojunction. This photodetector possesses a broad response spectrum from 350 to 950 nm with an average detection rate exceeding 1011 Jones and maintains excellent photoelectric performance over two months. Sn2+ doping effectively reduces the bandgap of Cs2AgBiBr6, enhancing its near-infrared absorption and optimizing energy level alignment with conjugated polymer (diketopyrrolopyrrole-terthiophene, PDPP3T). More importantly, the porous structure derived from Sn doping significantly improves carrier extraction and transport under a near-infrared light response at the heterojunction interface. Utilizing its broad spectral response characteristics in the UV–vis-NIR range, a novel information transfer and encryption system employing full optical modulation has been realized within a single perovskite photodetector. This work provides a new approach to fabricating lead-free double perovskite broadband photodetectors with potential applications in photonic devices.
研究领域:
材料科学
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光电技术
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纳米技术
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2015
·
IF 7.435
Wenwen Gao,Wenxia Liu,Yanhua Leng,Xiaowei Wang,Xingqi Wang,Bin Hu,Dehai Yu,Yuanhua Sang,Hong Liu
We, herein, report the synthesis of the first photocatalyst, tetragonal In 2 S 3 nanoparticles, to display broad-spectrum photocatalytic properties under ultraviolet (UV), visible, and near-infrared irradiation from a simple hydrothermal method. The as-synthesized In 2 S 3 nanoparticles have irregular morphology and possess a primary particle size of 5–20 nm with high photo-degradation abilities under UV (96.2% within 30 min), visible light (95.4% within 3 h) and near-infrared light (67.2% within 3 h), a phenomenon extremely rare in character with respect to a broad class of photocatalysts that have a single crystalline phase. This current work in broadband spectrum photocatalysis affords a new paradigm for the full utilization of solar light.
研究领域:
材料科学
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环境科学
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能源科学
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DOI
高影响因子
Journal of Nanomaterials
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2022
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IF 3.791
Ziyang He,Huan Liu,Fei Xie,Mingyu Bai,Shuai Wen,Jijie Zhao,Weiguo Liu
By the photodetector manufactured using traditional semiconductor materials, such as HgCdTe and InGaAs, it is difficult to broaden the application range of such photodetectors due to their high cost and complex manufacturing process. PbSe colloidal quantum dots (CQDs) have the potential to shift the working range of photodetector from visible to infrared wavelength region, and it also has high photoresponsivity. Herein, we report the characterization of PbSe CQDs synthesized using a facile solution process, as well as the relationship between the size of nanocrystal and the reaction temperature. The films of PbSe CQDs are deposited using the layer-by-layer (LbL) spin-coating method, which is then used to fabricate the photoconductive device. The fabricated device is found to have an efficient response in a broad spectrum range of 400-2600 nm. The device maintains good responsivity of ~320 mA/W at room temperature. Its external quantum efficiency was quite high in the shorter wavelength infrared region, and it has approximately 14% external quantum efficiency (EQE) at 2520 nm. The device demonstrated excellent performance, confirming that PbSe colloidal quantum dots is a promising material for future broadband spectrum photodetectors.
研究领域:
材料科学
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光电子学
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DOI
高影响因子
Nature Photonics
·
2024
·
IF 32.3
Mu Ge,Tan Yimei,Bi Cheng,Liu Yanfei,Hao Qun,Tang Xin
Photodetection over a broad spectral range is necessary for multispectral sensing and imaging. Despite the fact that broadband single-element detectors with high performance have been demonstrated with various low-dimensional materials, broadband focal plane array imagers have been rarely reported. Here we propose a stacked lead sulfide/mercury telluride colloidal quantum dot photodetector configuration with optimized graded energy gaps. This architecture allows for ultrabroadband spectral response from 0.4 to 5.0 µm, with responsivity values of 0.23, 0.31, 0.83 and 0.71 A W −1 at 0.4, 0.7, 2.2 and 4.2 µm, respectively. We also fabricate a focal plane array imager with a resolution of 640 × 512, a low photoresponse non-uniformity down to 6% and a noise equivalent temperature difference as low as 34 mK. We demonstrate broadband imaging by simultaneously capturing both short-wave infrared and mid-wave infrared information, as well as multispectral imaging in the red, green, blue, short-wave infrared and mid-wave infrared channels, using a set of optical filters.
研究领域:
光电技术
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材料科学
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成像技术
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DOI
高影响因子
Journal of Materials Chemistry C
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2024
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IF 5.7
Bingwei Li,Kai Wang,Nanyin Zhao,Zhentao Fu,Mingtao Wang,Zhuoqiao Xie,Jun Li
The rapid development of the internet of things (IOT) has led to a great demand for low-cost and high-performance self-powered photodetectors with ease of preparation. However, current self-powered photodetectors remain restricted by the high preparation costs or poor performance in the broad-spectrum range. In this paper, we report an organic–inorganic heterostructure self-powered photodetector constructed by compositing polyaniline (PANI) with Bi2O2S nanosheets, which showcases great potential in the IOT system, benefiting from the synergy of low cost and high performance in the broad-spectrum range (350–760 nm). In detail, at 0 V, the photocurrent density reached the maximum of ∼2.9 μA cm−2, while the dark current density was only ∼16 nA cm−2. Thus, the developed self-powered photodetector gave the maximum responsivity of ∼29.5 mA W−1 at 350 nm under 0 V, which is comparable to that of commercial self-powered electronic products with superior performance. The prominent performance of the device is attributed to the formation of an S-type heterojunction, which could be confirmed by density functional theory (DFT) and photoluminescence (PL). In addition, the response time (0.1 s) and cycle stability (over 10 days) confirm the reliability of the equipment. Overall, the proposed device provides a promising route for developing a low-cost, high-performance, broad-spectrum self-powered photodetector.
研究领域:
材料科学
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光电技术
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DOI
高影响因子
Laser & Photonics Reviews
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2025
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IF 10
Qiang Niu,Jiarui Hu,Han Hao,Rong Zhao,Guling Zhang,Jinfeng Zhu,Yuping Yang
Enhancing the interaction between light and matter, especially at the terahertz band, is pivotal for achieving ultra-broadband trace molecular fingerprint detection. Here, an efficient scheme featuring multiple Fabry–Pérot modes with equal intervals and uniform intensity is presented to implement a resonance interaction enhancement of molecular fingerprints with long-awaited precision and flexibility. This technique constructs uniform resonant probes across the entire spectral range to reveal molecular coupling effects via frequency-selective amplitude attenuation, enabling both qualitative and quantitative detection of L-tyrosine with a detection limit of 0.11 µg mm −2 . This is an inaugural experimental achievement of quantitative THz trace fingerprint detection with dual capabilities of achieving ultra-broadband and high-efficiency. Significantly, the technology enables direct identification of molecular absorption signatures from the transmitted multiple Fabry–Pérot modes using wavelet denoising algorithms, eliminating cumbersome data postprocessing and redundant testing procedures. This advancement heralds a new, accessible era in terahertz fingerprint spectroscopy.
研究领域:
生物物理化学
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分子光谱学
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生物医学工程
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转化医学
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分析化学
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DOI
高影响因子
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