APPLIED OPTICS
·
2022
·Vol. 61
·期 12
·3400-3408
·
IF 1.905
Haodong Zhang,Jing Luo,Jing Luo,Saimei Hou,Zhanpeng Xu,Julian Evans,Sailing He,Sailing He
Incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) can achieve sensitive measurements at trace concentrations for liquid phase marine samples. The IBBCEAS system consists of a cavity-enhancement module (CEM) and a transmission hyperspectral module (THM). The CEM has cavity-enhancement factors up to 78 at 550 nm. Measurements were obtained over a wide wavelength range (420–640 nm) with a halogen lamp, and the optical cavity was formed by two concave highly reflective mirrors (${\rm{R}} = {0.99}$). The minimum detectable absorption coefficient ${\alpha _{{\min}}}$ of ${7.3} \times {{1}}{{{0}}^{- 7}}\;{\rm{c}}{{\rm{m}}^{- 1}}$ at 550 nm corresponds to a limit of detection for nutrients of 780 pM. The spectral resolution of the THM is 3 nm in the wavelength range of 400 to 750 nm. We performed the IBBCEAS measurements for biological and chemical substances, including nutrients, microalgae, and Cy5 dye. The concentrations of nutrients in a deionized water environment and artificial seawater environment were measured at nanomolar levels; the concentration of microalgae phaeocystis was detected with ${3.46} \times {{1}}{{{0}}^4}/{\rm{mL}}$, and fluorescence substances such as Cy5 dye could be measured at 0.03 mg/L. Experimental results show that the IBBCEAS system has the capability for sensitive measurements of biological and chemical substances and has strong potential for in situ ecological marine environmental monitoring function.
研究领域:
分析化学
·
海洋科学
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产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Anqi Yang,Yan Huang,Songbao Fu,Haodong Zhang,Sailing He
A high-precision pH monitoring system over a wide pH range is introduced. The system comprises a cavity-enhancement module constructed by two high-reflectivity mirrors, a microfluidic pH sensing chip based on a binary-indicator membrane of Congo red and m-cresol purple, and a hyperspectral transmission module. This structure extends the effective absorption optical path of the sensing chip, significantly amplifying the spectral differences at various pH values. The spectrum of the transmitted light is recorded by a self-developed hyperspectral module and then converted to broadband cavity-enhanced absorption spectrum (BBCEAS) via the Beer-Lambert law. An artificial neural network (ANN) is employed to predict pH values of the solution. With such a design, this system exhibits a wide detecting range of 2 M [H + ] − 2 M [OH – ] (corresponding to pH −0.3–14.3) with a response time of about 120 s. The system can achieve a higher detection accuracy with root mean square error (RMSE) of 0.073, as compared to 0.137 without the cavity enhancement. The system also possesses good properties of repeatability, long-term stability, ion resistance, and organic corrosion resistance. These excellent properties make the proposed system a promising candidate technology for harsh environments, such as seawater acidification warning, chemical plant sewage monitoring, and biological sample detection.
研究领域:
分析化学
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环境科学
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生物医学工程
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2016
·Vol. 35
·期 2
·249-260
·
IF 1.811
Xu Xiao-peng,Zhang Guang-jun,Zhao Yun-zhe,Liu Jiang,Li Ying,Peng Qiang
A series of copolymers, based on benzo[1,2-b:4,5-b′]dithiophene (BDT) as the electron donor and 2,1,3-benzothiadiazole (BT)/diketopyrrolo[3,4-c]pyrrole (DPP) as the electron acceptors, were synthesized for highly efficient polymer solar cells. By changing the BT/DPP ratio in the conjugated backbone, the absorption, energy levels, molecular aggregation and carrier mobility could be finely tuned. With increased DPP content, the absorption range was extended to the longer wavelength region with narrower bandgaps. The highest occupied molecular orbital (HOMO) levels were also raised up and the molecular aggregation was enhanced. The balance of these factors would afford a remarkable device performance enhancement. Polymer P3 with BT:DPP = 0.7:0.3 (molar ratio) exhibited the highest power conversion efficiency (PCE) of 9.01%, with open circuit voltage ( V
oc = 0.73 V, short current density ( J
sc = 18.45 mA·cm −2 , and fill factor (FF) = 66.9%. The PCE value was improved by 48.7% compared to P1 and by 117.6% compared to P7, respectively, indicating a great potential in photovoltaic application.
研究领域:
高分子科学
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光伏技术
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材料科学
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有机电子学
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 80
·65575-65582
·
IF 3.84
Jian Wu,Yuxuan Liang,Pengpeng Bai,Shuqi Zheng,Liqiang Chen
Pyrite FeS2 microspheres with an average size of approximately 1.1 μm were successfully synthesised in high yield via a facile and efficient microwave-assisted method. X-ray diffraction patterns and high-resolution transmission electron micrographs showed that the microspheres had a pure single crystalline phase. Scanning electron micrographs and transmission electron micrographs illustrated that the microspheres were uniform and well-distributed. The absorption spectra of the as-obtained microspheres showed that pyrite exhibited high absorbance in the visible region. The surfactants influenced the phase, morphology and absorption property of the products. Long reaction time allowed the formation of uniform pyrite FeS2 microspheres with smooth surfaces. The microwave-assisted method yielded products with better morphology and absorption properties than the high-pressure solvothermal method.
研究领域:
材料科学
·
化学
·
纳米技术
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DOI
高影响因子
Biomaterials Science
·
2021
·Vol. 9
·期 21
·7124-7133
·
IF 6.843
Wencheng Liang,Qiaohui Lu,Fan Yu,Junyong Zhang,Chuang Xiao,Xiaoming Dou,Yan Zhou,Xiumei Mo,Jun Li,Meidong Lang
Rapid hemostasis and antibacterial properties are essential for novel wound dressings to promote wound healing. In particular, timely and rapid hemostasis could be of benefit to reduce the mortality caused by excessive bleeding loss. Herein, we present a novel strategy of combining electrospinning technology with post-modification technology to prepare a multifunctional wound dressing, cellulose diacetate-based composite wound dressing (CDCE), with rapid hemostasis and antibacterial activity. It is interesting that the CDCE wound dressing had superhydrophilicity, high water absorption, and strong absorbing capacity, which could eliminate the exudate around the wound in a timely manner and further promote rapid hemostasis. Additionally, its excellent antibacterial properties could inhibit severe infection in the wound and accelerate wound healing. Based on these advantages, the novel CDCE wound dressing could promote wound contraction and further accelerate wound healing compared with the common traditional wound dressing gauze. Taken together, the multifunctional CDCE wound dressing has high potential for clinical application in the future.
研究领域:
材料科学
·
生物医学工程
·
伤口护理
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Xueqing Xu,Feitian Ran,Hua Lai,Zhongjun Cheng,Tong Lv,Lu Shao,Yuyan Liu
Metal–organic framework (MOFs) derived magnetic nanoparticles/porous carbon (M/C) composites featuring efficient interfacial engineering and spatially continuous three-dimensional (3D) networks are desirable electromagnetic wave (EMW) absorbing materials due to multiple transmission path and well impedance matching. However, it is challenging to construct such 3D interconnected carbon networks from a single MOF precursor. Herein, FeNi3 and N embedded 3D carbon networks comprising bamboo-like carbon nanotubes connected carbon nanorods (FeNi@CNT/CNRs) were prepared via one-step pyrolyzing of the composite of melamine and FeNi-MIL-88B. Attributed to the synergistic contributions of 3D interconnected carbon nanotube networks and MOFs derived M/C for multiple transmission path, impedance matching, and dielectric loss (especially for multiple polarization and micro-current), the FeNi@CNT/CNRs nanoarchitectures have demonstrated superior EMW absorbing performance. In particular, the optimized FeNi@CNT/CNR-0.9 has exhibited strong absorption (−47.0 dB, 2.3 mm in thickness) and broadband effective absorption (4.5 GHz, 1.6 mm in thickness). This attractive strategy holds promise as a general approach to fabricate the carbon hybrid network constituted of MOFs derived nanopolyhedron and CNTs for the target application.
研究领域:
材料科学
·
纳米技术
·
电磁材料
·
复合材料
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产品关联
DOI
PubMed
高影响因子
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