A mechanistic framework for hot carrier cooling process in CsPbBr3 PNC is depicted via transient absorption spectroscopy.

Developing biosensors with advanced nanomaterial is crucial to enhance the sensing performance of the as-fabricated biosensors. Herein, we engineered copper(II) oxide (CuO) nanofibers using a hydrothermal route in a four-neck flask. The structural and morphological properties of as-engineered CuO nanofibers were analysed using an X-ray diffractometer, field-emission scanning, and transmission electron microscopes. The results indicated, CuO nanofibers bear nanosized diameters and length is in the order of micrometers. These CuO nanofibers were utilized to fabricate non-enzymatic biosensors (Nafion/CuO nanofibers/GCE (glassy carbon electrode)) for enhanced glucose detection and the sensing performance of the biosensors were evaluated using cyclic voltammetry (CV) technique in sodium hydroxide buffer. Employing engineered CuO nanofibers as a non-enzymatic material led fabricated biosensor to achieve high sensitivity of 483.10 μMmM–1cm–2, with the lower detection limit (200 nM) and 0.10–10.85 mM linear detection range. Further, the fabricated biosensor showed good reproducibility, excellent selectivity, cyclic and long-time storage stabilities. This work presents a simple hydrothermal technique to prepare CuO nanofibers in large quantity, demonstrating cost-effective synthesis for non-enzymatic biosensor fabrications and many other applications.

Nanomaterials-based sensors are in demand for early-stage disease detection as a diagnostic tool. Here, we prepare a non-enzymatic electrochemical sensor using hydrothermally synthesized nano-berries shaped cobalt oxide (Co3O4) nanostructures on...

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Herein, a strategy has been executed to reduce the trap states in as‐synthesized CsPbBr3 perovskite quantum dots (PQDs) by using the capping of trioctylphosphine (TOP) which is further evident by the ultrafast spectroscopic technique. Moreover, the excitation source powers and unvarying excitation energy‐dependent studies were carried out to compare the hot carrier (HC) cooling dynamics in the PQDs and TOP‐capped CsPbBr3 PQDs (TOP‐PQDs) to explain the diminution of trap states in TOP‐PQDs. The HC cooling time has been calculated and found that 469.2 fs for PQDs whereas 394.8 fs is for TOP‐PQDs, respectively. From these HC cooling times, it can be concluded that TOP‐PQDs is more capable to intensify the process of HC relaxation from the higher energy states to the conduction band and contribute to suppress the charge trappings that supports the radiative recombination, which demonstrates the enhancement in the PL intensity and PLQY (i. e., 98.8 %). Likewise, and simultaneously at the excitation wavelength e.g., (λexcitation=410nm,3.02eV) , TOP‐PQDs show an improved ground state bleaching (GSB) intensity signal than PQDs at three excitation source powers (e.g.P=300μW,200μW,and100μW) in the following order: TOP‐PQDs P=3004ptμW> PQDs ()P=300μW , TOP‐PQDsP=2004ptμW> PQDs()P=200μW , and TOP‐PQDs P=1004ptμW> PQDs ()P=100μW , respectively.

Uric acid (UA) level quantification is crucial for the diagnosis and treatment of cardiovascular, arthritis, renal disorder, and preeclampsia diseases. We report solvent-assisted synthesis of zinc oxide (ZnO) nanoparticles (NPs)...

Graphitic carbon nitride, (g-CN/g-C3N4), an oldest material, was extensively used as photocatalyst due to high charge separation and transportation property, tunable band gap, and non-toxicity. Recently, g-CN has been utilized as an electron transport layer, interfacial buffer layer, and for passivation of perovskite layers in solar cell devices. Power conversion efficiency of g-CN-based solar cells has gone beyond 22.13% with device stability of more than 1500 h in dark. Additionally, the enhanced environmental stability of solar cell devices is due to the unique packed two-dimensional (2D) structure of g-CN, which provides protection to the devices against environmental degradation. However, availability of the limited synthesis methods and g-CN thin film formation with varying properties and high surface area, are two major concerns which needs to be further improved. This review covers the different methods of g-CN nanostructure synthesis, thin film formation, and their application in photovoltaic (PV) devices. The potential challenges and perspective of g-CN nanomaterials for solar cells are also included in this review.

CsPbBr 3 perovskite nanocrystals (mainly nanoplatelet morphology) have attracted attention due to their promising applications in optoelectronic devices. However, ultraviolet (UV) light exposure to these materials is one of the major factors for the degradation of halide perovskite nanocrystals, which needs to be studied to improve stability and boost performance. In this study, we synthesized CsPbBr 3 perovskite nanoplatelets utilizing a hot injection method. The UV illumination effect on luminescence and structural properties of perovskite CsPbBr 3 nanoplatelets were studied in detail. Under UV light illumination, less-emissive phases like CsPb 2 Br 5 were observed within 10 h. However, long-term (i.e., 48 h) illumination of UV light resulted in the formation of some trace of PbCO 3 and PbO phases that causes further degradation of perovskite CsPbBr 3 nanoplatelets. This was verified by a significant decrease in photoluminescence (PL) intensity. Interestingly, UV light treated samples exhibited a stable CsPb 2 Br 5 phase, which was observed after aging for a long period (∼9 months) of time that showed no further degradation. Furthermore, X-ray diffraction and full-width half maxima results confirmed an increase in crystalline size with illumination time increase. Obtained results strongly indicate that the UV light-induced PL degradation and trap state formation causes a synergistic effect of photo annealing in the presence of oxygen and moisture.