An
ultrasensitive Ag-deposited TiO2 flower-like nanomaterial
(FLNM) surface-enhanced Raman scattering (SERS)-active substrate is
synthesized via a hydrothermal method, and Ag nanoparticles (NPs)
are deposited through electron beam evaporation. Malachite green (MG),
which is widely used in aquaculture, is employed to assess the surface-enhanced
Raman scattering (SERS) properties of TiO2/Ag FLNMs. They
exhibit ultrasensitivity (limit of detection (LOD) of MG reaches 4.47
× 10–16 M) and high reproducibility (relative
standard deviations (RSDs) are less than 13%); more importantly, the
TiO2/Ag FLNMs are recyclable, as enabled by their self-cleaning
function due to TiO2 photocatalytic degradation. Their
recyclability is achieved after three cycles and their potential application
is examined in the actual system. Finite difference time domain (FDTD)
simulations and the charge-transfer (CT) mechanism further prove that
the excellent SERS properties originate from localized surface plasmon
resonance (LSPR) of Ag NPs and the coupling field between Ag and TiO2 FLNMs. Therefore, TiO2/Ag FLNMs show promising
application in aquaculture.
The limited detection of lead iodide (PbI2) to visible light hinders the further development of PbI2 in the field of optoelectronic applications. A photodetector based on PbI2 nanosheet/CdSe nanobelt (PbI2 NS/CdSe NB) is prepared for the first time. This composite structure exhibits broadband spectral photoresponse from ultraviolet (400 nm) to red (730 nm). More importantly, PbI2 NS/CdSe NB can promote the effective separation of electron–hole pairs and improve the photoelectric performance. Compared to single PbI2 NS, the PbI2 NS/CdSe NB photodetector exhibits higher light–dark current ratio (6.778 × 103 A), responsivity (347.57 A W−1), and detectivity (3.625 × 1015 Jones) under 490 nm illumination. A new strategy is provided here to design broadband and high‐performance photodetectors.
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