Two-Dimensional Fluorescent Strategy Based on Porous Silicon Quantum Dots for Metal-Ion Detection and Recognition

Abstract

A two-dimensional photoluminescent (2D PL) detection strategy was established based on luminescent porous silicon (LuPSi) with wide-size-distributed silicon quantum dots and abundant surface chemistry. Owing to the intrinsic nature of LuPSi, interaction or reaction between analytes and LuPSi may cause static, dynamic, oxidationinduced, and deposition-induced quenching. By monitoring of both the PL intensity change and peak shift of LuPSi, the 2D PL detection strategy could discriminate different analytes. Detection and recognition of different metal ions in real water samples using a single peak were realized. Compared with the existing array-based methods, the 2D PL approach significantly simplified the sensing element and detection process.

Synergistic and On-Demand Release of Ag-AMPs Loaded on Porous Silicon Nanocarriers for Antibacteria and Wound Healing

“…A PSi freestanding film was prepared by an electrochemical etching and exfoliating procedure . The porosity and thickness of the PSi were ∼61.6% and 21.2 μm, respectively, as tested by the spectroscopic liquid infiltration method (SLIM) .…”

“…A PSi freestanding film was prepared by an electrochemical etching and exfoliating procedure. 36 The porosity and thickness of the PSi were ∼61.6% and 21.2 μm, respectively, as tested by the spectroscopic liquid infiltration method (SLIM). 48 PSiMPs were obtained by fracturing the PSi freestanding film in an ultrasonic bath for 15 min under 100 W ultrasonic power.…”

“…In addition, the synergistic release of a multidrug-loaded delivery system also remains a major challenge . Porous silicon (PSi) is a promising carrier material for drug delivery due to its tunable pore structure and surface chemistry, as well as its biocompatibility and degradability. , PSi has been widely used in biological and medical applications, such as reactive oxygen species (ROS) monitoring, RNA delivery, and anti-infection applications. − Our previous work demonstrated that the pore structure of PSi can be controlled to exclude larger proteases that may catalyze the digestion of peptides . Moreover, both oxidants and alkali ions can accelerate the oxidation (or corrosion) of PSi by nucleophilic attack on silicon atoms, resulting in the formation of a silicon oxide layer, which can be further hydrolyzed and dissolved in the aqueous solution by generating a silicic acid product.…”

“…34 Porous silicon (PSi) is a promising carrier material for drug delivery due to its tunable pore structure and surface chemistry, as well as its biocompatibility and degradability. 35,36 PSi has been widely used in biological and medical applications, such as reactive oxygen species (ROS) monitoring, RNA delivery, and anti-infection applications. 37−41 Our previous work demonstrated that the pore structure of PSi can be controlled to exclude larger proteases that may catalyze the digestion of peptides.…”

Quantum Dots and Their Applications: What Lies Ahead?

“…47 Real water samples were also analyzed for the presence of toxic metal ions using luminescent porous Si with wide-sizedistributed Si QDs. 48 Moreover, blue fluorescent WS 2 QDs have shown high sensitivity and selectivity for ferric (Fe 3+ ) ions, 49 while surface-functionalized MoSe 2 QDs worked as chemosensors for Cu 2+ , 2,4,6-trinitrophenol, and melamine. 50 Peroxide sensing was demonstrated for Fe 3 O 4 QDs by both the nanozymatic activity and fluorescence quenching mechanisms.…”