- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Rapid preparation of homogeneous carbon dots with yellow fluorescence and formation mechanistic investigation
摘要： In this study, homogeneous carbon dots with yellow fluorescence and high absolute fluorescence quantum yields (78.6%) were firstly prepared through a one-step solvothermal method without complicated process of separation, in which sodium citrate, carbamide, and anhydrous calcium chloride were adopted as precursors, while toluene was selected as solvent. The as-prepared carbon dots with an average size of 5.9 nm have a high degree of crystallinity. According to the discussion of the formation mechanism carbon dots, it is found that the toluene guarantee the formation of crystalline core and Ca2+ promotes the formation of carbonaceous core with high crystallinity, which is responsible for the ultrahigh quantum yield. Furthermore, the fluorescent properties of carbon dots are excellent in organic solvents and could be quenched by water, making them a promising material used without any modification in the detection of water in organic solvents, which has a great influence on organic chemical reaction, and may even determine the resultant, yield, and selectivity of organic reaction.
关键词： Detection of water content,Ultrahigh quantum yield,Yellow fluorescence,Carbon dots,Quantum dot
更新于2025-11-14 15:28:36
-
Fe doped ZnO/BiVO4 heterostructure based large area, flexible, high performance broadband photodetector with ultrahigh quantum yield
摘要： Pristine ZnO has been widely explored for UV photodetectors; however it’s utility in broadband photodetectors is still an impediment due to absorbance in UV region only with low quantum efficiency and responsivity that can be accredited to high recombination rate of photo generated charge carriers. To address this issue, we report Fe metal doped 2D ZnO thin films through band gap engineering and 1D electrospun mixed inorganic monoclinic BiVO4 nanofibers heterostructure on ITO coated PET substrate based broadband photodetector (PD) with ultra-high responsivity and EQE values in comparison to PDs fabricated using expensive cleanroom techniques. BiVO4 plays the dual role of captivating photons in the visible and NIR regions and creating local electric fields at the interface of Fe doped ZnO (FZO)-BiVO4 heterostructure which helps in separation of electron-hole pairs. The robustness of the flexible PD was further examined under repeated conditions of bending cycles (upto 500) yielding stable response. The responsivity values obtained for UV, Visible and NIR lights are 7.35 A/W, 3.8 A/W and 0.18 A/W with very high EQE values of 2501.7 %, 851.2 % and 28.3 % respectively. The facile and cost-effective fabrication of the device with high performance gives a new approach for developing flexible electronics and high-performance optoelectronics devices.
关键词： Heterostructure,Broadband photodetector,Fe doped ZnO,BiVO4,ultrahigh quantum yield
更新于2025-09-23 15:21:01