Hebei Normal University

This study employed a pore-confined synthesis strategy to achieve the in situ growth of bovine serum albumin-capped copper nanoclusters (BSA-CuNCs) within the UiO-66 framework (BSA-CuNCs@UiO-66). This nanocomposite enables highly sensitive and specific detection of creatinine (CR). Results demonstrated that the spatial confinement imposed by UiO-66 induced aggregation of the BSA-CuNCs and suppressed non-radiative transitions, leading to an approximately 10-fold enhancement in fluorescence intensity and a 11-fold increase in quantum yield. Leveraging the specific adsorption and enrichment capability of the UiO-66 framework toward CR, the BSA-CuNCs@UiO-66 fluorescence probe exhibited significant fluorescence quenching upon exposure to CR, achieving a detection range of 50-1000 nM and a detection limit of 30.81 nM. This work presented a novel confinement engineering strategy utilizing metal-organic frameworks (MOFs), establishing a new design paradigm for high-performance fluorescence probes with significant potential in bioanalytical applications.

Thermal-vibrational-activation-dominated hot-band absorption (HBA) is a key mechanism for achieving anti-Stokes luminescence, utilizing environmental thermal energy to enable photon emission at energies higher than absorption. The HBA necessitates thermal vibrational activation (υ = 0 → 1), which remains a challenging yet critical task in molecular design. This study presents a molecular design strategy integrating a multi-resonance core with tailored peripheral groups. Through the modification of the surrounding groups, the vibrational modes that contribute to the thermal vibrational activation can be modulated. The mechanism of the thermal vibrational activation is elucidated by distinguishing the roles of the resonance core and peripheral groups in governing low- and high-energy vibrational modes, respectively. Based on statistical mechanics, a theoretical approach is proposed to analyze the contribution of each vibrational mode. A structure-property relationship is established for HBA systems, providing a foundational framework for the development of advanced anti-Stokes luminescent materials.

A MoSe₂ nanosheet/Si heterojunction photodetector with a graphene electrode was fabricated via mechanical exfoliation. This work demonstrates that graphene significantly enhances carrier mobility within the MoSe₂ nanosheets, thereby facilitating efficient separation and transport of photogenerated carriers from the heterojunction interface to the top electrode. This mechanism consequently leads to a substantial improvement in overall device performance. The fabricated device demonstrates a rectification ratio of 1294.3 at room temperature. Under 650 nm red light illumination, it exhibits a responsivity (R) of 229.8 A/W, a specific detectivity (D^*) of 1.9 × 10¹² Jones, and an external quantum efficiency (EQE) of 4.5 × 10⁴%. Under 405 nm blue light illumination, it achieves an R of 201.9 A/W, a D^* of 1.7 × 10¹² Jones, and an EQE of 6.2 × 10⁴%. The device demonstrates broadband photodetection capability across the visible to near-infrared spectrum, featuring the fastest measured rise and fall times of 810 and 950 μs at 700 nm wavelength. Furthermore, temperature-dependent measurements reveal a significant impact on optoelectronic properties: At low temperatures, the photoresponse performance deteriorates due to the reduction of the effective barrier height within the device.