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oe1(光电查) - 科学论文

5 条数据
?? 中文（中国） ▾

  • A novel fluorescent nanosensor based on small-sized conjugated polyelectrolyte dots for ultrasensitive detection of phytic acid

    摘要： A novel nanosensor is developed for selective and highly sensitive detection of phytic acid (PA) based on small-sized conjugated polyelectrolyte dots (Pdots) fabricated from a new conjugated polymer (P1) by a modified reprecipitation method. P1 featuring a π-delocalized backbone bearing meta-substituted pyridyl groups can be endowed with enhanced flexibility and hence is beneficial for the synthesis of ultrasmall Pdots (i.e. Pdot-1, ~3.8 nm in average diameter) as well as for the binding of Fe3+, thus leading to the obvious fluorescence quenching of Pdot-1 (~444 nm) in the presence of Fe3+ via an electron transfer (ET) process. In addition, phytic acid with six phosphate groups exhibits strong chelating ability. When phytic acid is added, phytic acid readily binds to Fe3+ and the fluorescence of Pdot-1 around 444 nm can be recovered, rendering the supersensitive and selective sensing of PA. Under the optimum conditions, this ultra-small Pdot-based nanoprobe favors the fluorescent determination of PA with the detection limit as low as 10 nM. Particularly, Pdot-1 with bright blue fluorescence exhibits low cytotoxicity. Furthermore, the small-sized and biocompatible Pdot-1 can be applied to the sensitive fluorescence assay for PA in cell extracts and the efficient imaging of PA in live cells.

    关键词： Fluorescence,Imaging,Small-sized conjugated polyelectrolyte dots,Phytic acid

    更新于2025-11-14 15:29:11

  • Conjugated polyelectrolyte with potassium cations enables inverted perovskite solar cells with an efficiency over 20%

    摘要： Defect-passivation functional groups have been extensively explored in perovskite solar cells (PSCs) in recent years; however, most of these groups were organic, and the integration of inorganic functional groups with organic matrixes bearing other functions has rarely been reported. Here, to demonstrate the effective of this integration, the coalition of an inorganic group, K+ ion, and an organic conjugated polyelectrolyte (CPE) matrix which serves as a hole transporting material (HTM) is attempted. The resulting CPE material TB(K) presents much stronger ability of defect-passivation and hole extraction, and thus yields a much lifted power conversion efficiency (PCE) of 20.01% and an increased long-term stability when applied in the inverted PSC devices compared with its control polymer TB(Na), where only the inorganic cations are varied from a defect-passivation group to a common one.

    关键词： inorganic functional groups,defect-passivation,perovskite solar cells,hole transporting material,conjugated polyelectrolyte

    更新于2025-09-19 17:13:59

  • Humidity-Controlled Water Uptake and Conductivities in Ion and Electron Mixed Conducting Polythiophene Films

    摘要： Mixed conducting polymer films are of great interest in applications where an interface between electronic and ionic charge transport is of high relevance not only for aqueous environments but also for devices that are manufactured at ambient conditions with varying relative humidities. In this contribution, we present our results on the influence of controlled humidity changes on the mixed conductivity and correlation to the concomitant water uptake in the films. Two sulfonate-bearing polythiophene systems are studied: a self-made conjugated polyelectrolyte, poly(6-(thiophen-3-yl)hexane-1-sulfonate)-sodium (PTS-Na), and poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT/PSS) with different ratios of PEDOT and the polyelectrolyte PSS. Our data give clear evidence of the similarities between the aforementioned polythiophene systems and pure ionic membranes such as Nafion used in fuel cells. As such, a phase separation between the hydrophobic electronically conducting polythiophene phase and the hydrophilic water-swellable ion-conducting phase is proposed. Changing the humidity from dry conditions up to ～90% relative humidity results in extremely high water uptakes of more than 90 wt %, which corresponds to ～13 water molecules per sulfonate unit at maximum water uptake. Conversely, the electronic conductivity is less sensitive to increasing humidity, which is due to percolation pathways. The ionic conductivity strongly increases from 10?10 S/cm at dry conditions to 10?3 S/cm at around 30 wt % water content and then levels off at maximum conductivities of 10?3?10?2 S/cm up to water contents of 90 wt %.

    关键词： water content,conjugated polyelectrolyte,PEDOT/PSS,AC impedance,mixed conductivity

    更新于2025-09-16 10:30:52

  • Efficient polymer solar cells that use conjugated polyelectrolyte with a tetravalent amine-end side chain

    摘要： Conjugated polyelectrolyte based on benzotriazole (BT) with tetravalent amine-end side chain and benzothiadiazole (BTz) conjugated alternating repeat units, named PBTBTz-TMAI was initially designed and synthesized. Fullerene- and non-fullerene-based polymer solar cells were fabricated using PBTBTz-TMAI as the cathode interlayer. Consequently, power conversion efficiencies of 8.4% and 10.5% were achieved for the fullerene PTB7:PC71BM-based and non-fullerene PBDB-T:ITIC-based single-junction devices, respectively. The enhanced performance is attributed to the appropriate energy level alignment of the active layer with PBTBTz-TMAI and the efficient electron transfer from the active layer to the cathode electrode.

    关键词： cathode interlayer,non-fullerene,tetravalent amine-end,conjugated polyelectrolyte,polymer solar cells

    更新于2025-09-12 10:27:22

  • Water-Dispersed Conjugated Polyelectrolyte for Visible-Light Hydrogen Production

    摘要： Conjugated polymer-based photocatalysts have shown great potential in H2 production via water splitting, but an intrinsic drawback of conventional hydrophobic polymer photocatalysts is their poor wettability and relatively large particle size in aqueous media, which is favorable for charge recombination with limited interfacial reaction efficiency. Herein, a well-dispersed organic water reduction system using cationic conjugated polyelectrolyte as the photocatalyst has been reported for the first time. In comparison to a model polymer (PFBT) bearing the same conjugated backbone, the polyelectrolyte exhibits significantly enhanced photocatalytic efficiency due to the extended light absorption and improved charge separation of the polymer aggregates.

    关键词： conjugated polyelectrolyte,water-dispersed,visible-light hydrogen production

    更新于2025-09-10 09:29:36