No abstract

A Cd­(II)-based metal–organic framework as fluorescent chemical sensor, formulated as {[Cd3(bmipia)2]·10DMF·5H2O} n (FCS-2), was synthesized through a hydrothermal process and structurally characterized via X-ray crystallography. FCS-2 represented a new three-dimensional framework assembled from a semi-rigid aromatic carboxylate ligand and exhibited fascinating fluorescence due to the highly crystalline and ordered molecular structure. The emission of FCS-2 could be quenched, interestingly, by the presence of trace 2,4,6-trinitrophenol, which indicated that FCS-2 can be applied as a potentially sensitive fluorescent chemical sensor for the detection of nitroaromatic compounds.

The successful application of electrochemiluminescence (ECL) in immunoassays for clinical diagnosis requires stable electrodes and high‐efficient ECL signal amplification strategies. Herein, the authors discovered a new class of atomically dispersed peroxidase‐like nanozymes with multiple active sites (CoNi‐MOF@PCN‐224/Fe), which significantly improved the catalytic performance and uncovered the underlying mechanism. Experimental studies and theoretical calculation results revealed that the nanozyme introduced a Fenton‐like reaction into the catalytic system and the crucial synergistic effects of definite active moieties endow CoNi‐MOF@PCN‐224/Fe strong electron‐withdrawing effect and low thermodynamic activation energy toward H2O2. Benefiting from the high peroxidase‐like activity of the hybrid system, the resultant ECL electrode exhibited superior catalytic activity in the luminol‐H2O2 system and resulted in an ≈17‐fold increase in the ECL intensity. In addition, plasmonic Ag/Au core‐satellite nanocubes (Ag/AuNCs) were designed as high‐efficient co‐reactant quenchers to improve the performance of the ECL immunoassay. On the basis of the differential signal amplification strategy (DSAS) proposed, the immunoassay displayed superior detection ability, with a low limit of detection (LOD) of 0.13 pg mL−1 for prostate‐specific antigen (PSA). The designed atomically anchored MOF‐on‐MOF nanozyme and DSAS strategy provides more possibilities for the ultrasensitive detection of disease markers in clinical diagnosis.

Photoelectrochemical (PEC) water splitting is a hopeful tactic to convert solar power into clean hydrogen energy. However, the poor bulk charge-separation ability and sluggish oxygen evolution dynamics of the photoanodes...

Water splitting through photoelectrochemical (PEC) catalytic reaction holds significant promise for energy conversion. However, the low energy‐storage efficiency severely hinders the practical applications owing to the narrow spectral absorption and adverse charge recombination. Herein, a plasmon‐enhanced catalyst, integrating metal–organic frameworks (MOFs)‐derived Cd0.8Zn0.2S with Ag/Au hollow porous nanoshells (Ag/Au HPNSs), is rationally designed to afford Ag/Au HPNS‐Cd0.8Zn0.2S nanoshells (Ag/Au HPNS‐Cd0.8Zn0.2S NSs), which extends the absorption range from the ultraviolet to the near‐infrared region. The PEC performance shows that the photocurrent of the anode exhibits an approx. tenfold enhancement and full spectral response compared with the intrinsic ZIF‐8 dodecahedrons. More detailed exploration and theoretical simulations find that the MOFs‐derived Cd0.8Zn0.2S, with a high dielectric constant, can markedly prevent the decay of the plasmon fringing field and broaden the interaction range of the electromagnetic field. Such a synergistic effect finally improves the charge separation efficiency and results in the superior PEC performance of the photoanode. This work offers a new method for the construction of efficient PEC catalysts and provides new insights into the understanding of the plasmonic effect on catalytic reactions.