- 标题
- 摘要
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- 实验方案
- 产品
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Photo-Sensitive Pb5S2I6 Crystal Incorporated Polydopamine Biointerface Coated on Nanoporous TiO2 as an Efficient Signal-on Photoelectrochemical Bioassay for Ultrasensitive Detection of Cr(VI) ions
摘要： An ultrasensitive Visible light-triggered photoelectrochemical (PEC) sensor was designed based on ideal photoactive lead sulfoiodide (Pb5S2I6) as low band gap crystal, which hydrothermally synthesized rapidly at low temperature (160°C) in hydrochloride acid media followed by its incorporation into polydopamine as reactive photo-biointerface, through a facile in situ electropolymerization method, coated on nanoporous TiO2 grown by anodization on Ti foil. The structure of as-prepared samples and their photoelectrochemical properties were fully characterized. This unique photo-sensitive Pb5S2I6 catalyst-based PEC bioassay was constructed for the detection of low-abundant Cr(VI) ion in real samples. Applying central composite design, individual and mutual interaction effects were evaluated to obtain optimized solution pH, applied potential and radiant light wavelength as operational factors influencing the PEC efficiency for Cr(VI) detection. At optimal condition, the proposed sensor due to effective suppress in electron–hole recombinations showed a very low detection limit of 3.0 nM, over a broad linear concentration range of 0.01 μM-80 μM in addition to high sensitivity versus 1.9 μA/μM Cr(VI). Proposed PEC sensor displayed high selectivity, reproducibility and stability as well as improved excitation conversion efficiency, which make it highly applicable using solar energy. The potential applicability of the designed sensor was evaluated in water, tomato juice and hair color.
关键词： Photoelectrochemical biosensor,Nanoporous TiO2,Cr(VI) ions,Visible light excitation.,Pb5S2I6 crystal
更新于2025-11-21 11:01:37
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[IEEE 2018 IEEE SENSORS - New Delhi, India (2018.10.28-2018.10.31)] 2018 IEEE SENSORS - Single-Crystalline Metal Oxide, Resistive Gas Sensors Advances and Perspectives
摘要： Here we review recent results on the synthesis of single-crystalline metal oxide nanomaterials and their integration in resistive gas sensing devices. Emphasis is put on the integration of such nanomaterials in a wide spectrum of transducing platforms, ranging from standard ceramic to silicon MEMS or flexible polymeric. Some strategies for achieving higher selectivity are discussed, which are followed by a discussion on the development of advanced operation techniques for achieving more stable and faster response to gases. Finally, some aspects that remain open for research are identified.
关键词： surface potential control,nanowires,nanoparticles,chemoresistors,metal oxides,UV light excitation
更新于2025-09-19 17:15:36
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Efficient visible-light excitable Eu3+-complexes for red organic light-emitting diodes
摘要： Visible-light excited Eu3+-complexes have received much attention in the last years due to the rapidly increasing demand for less-harmful biomarkers and optoelectronics. Nevertheless, these complexes usually exhibit poor emission quantum yields, contrarily to the ones excited in the ultraviolet spectral region. To address this challenge, a series of complexes based on trivalent lanthanide ions, [Eu(bpyO2)(CH3OH)2(H2O)(NO3)2](NO3) (1), [Gd(bpyO2)(H2O)4(Cl)2]Cl (4), Ln(tta)3(H2O)(C2H5OH) (Ln = Eu (2), Gd (5)) and Ln(tta)3(bpyO2) (Ln = Eu (3), Gd (6)), are synthesized using 2-thenoyltrifluoroacetone (Htta) as primary ligand and 2,2′-dipyridyl N,N′-dioxide (bpyO2) as neutral donor, and characterized, with special emphasis on their crystal structures and luminescence properties. Single crystal X-ray diffraction revealed that the central metal ion has a coordination number of 9 in 1, and 8 in all other complexes. Complex 3 exhibited a broad excitation spectrum ranging from 250 to 480 nm, exhibiting, when compared to 1 and 2, higher absolute emission quantum yields of 0.46, 0.36 and 0.33, for excitation at 400, 425, and 450 nm, respectively. The theoretical intensity parameters, radiative and non-radiative decay rates, and intrinsic and absolute emission quantum yields were assessed using the LUMPAC software displaying a very good accord with the experimental values. Moreover, organic light-emitting diodes with a maximum efficiency of 5.7 × 10?2 cd·A?1 at 14 V were fabricated using 3 as an emitting layer.
关键词： Luminescence,OLED,LUMPAC,Europium,Visible-light excitation
更新于2025-09-19 17:13:59