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[Display omitted] • NIR-II excitation semiconductor polymer with NIR-IIa fluorescence imaging ability. • NIR-II excitation phototheranostic nanomedicine by coordination self-assembly. • Aptamer mediated active targeting and multimodal theranostics towards TNBC. • NIR-II PTT and GSH depletion amplified oxidative stress and cuproptosis sensitization. Owing to easy copper efflux, the deficiency of targeting delivery and limited tissue penetration depth of light, the combination therapy of cuproptosis and phototheranostics remains enormous challenges towards triple-negative breast cancer (TNBC). To overcome these obstacles, a NIR-II excitation multifunctional nanomedicine is prepared by self-assembly of targeting aptamers (AS1411) utilizes metallic copper ions as coordination nodes, followed by coated with ultrasmall NIR-II polymer dots (Pdots) with excellent optical performances, forming a carrier-free hybrid nanosystem. After positive targeting into TNBC through specific recognition of aptamer towards cell surface nucleolin, Pdots loaded in nanomedicine enable NIR-IIa fluorescence/NIR-II photoacoustic imaging-guided NIR-II photothermal therapy (PTT) under NIR-II (1064 nm) light excitation, achieving precise phototheranostics of TNBC tumors. The loaded Cu(II) is reduced to cytotoxic Cu(I) by intracellular glutathione (GSH) and ferredoxin 1 (FDX1), synchronously enabling chemodynamic therapy (CDT) and inducing cuproptosis against TNBC. NIR-II PTT and GSH depletion further enhance therapeutic efficiency of CDT and cuprptosis through cell sensitization. This work provides a new attempt to integrate NIR-II phototheranostics and cuproptosis into a single nanoplatform with targeting capability for synergistic therapy of TNBC. [ABSTRACT FROM AUTHOR]

Excessive antibiotic residues increased the environmental damage and safety of animal products, leading to serious health threats. In this study, a dual-mode probe was developed and applied as an electrochemical/fluorescence sensor for tetracycline (TET) detection. The probe, comprising a fluorescent covalent organic framework, electroactive methylene blue, gold nanoparticles (AuNPs) and single-stranded DNA, was synthesized by self-assembly. A glassy carbon electrode was functionalized with molybdenum disulfide nanosheets, AuNPs, and aptamers. The probe exhibited fluorescent signals in solution and electrochemical signals after being specifically connected to the electrode via hybridization. In the presence of TET, the probe is be competitively expelled from the modified electrode, resulting in an increase in the fluorescent signal and a decrease in the electrochemical signal. The developed electrochemical/fluorescence dual-mode sensor enabled sensitive TET detection in the concentration range of 10 nM–10 mM, with minimum detection limits of 0.03 nM (electrochemical) and 0.05 nM (fluorescence). With its high selectivity, superior reproducibility, and excellent stability, the proposed dual-mode sensor demonstrates high reliability, and excellent application prospects for TET detection in milk and river water samples. • An electrochemical/fluorescent dual-mode probe based on covalent organic framework. • Opposite signals of fluorescent on and electrochemical off for tetracycline detection. • Electrode conductivity was improved by AuNPs@MoS 2 NS. • Constructed biosensor showed good performance for tetracycline detection. [ABSTRACT FROM AUTHOR]

• CQDs and GNPs were synthesized as fluorescence and colorimetric nanomaterials, respectively. • CQDs-GNPs-based dual-mode nanosensor was applied for malathion detection. • Standard arrays were fabricated by a smartphone and used for visual detection of malathion. • Cabbages adulterated by malathion were detected by the established calibration curves and standard arrays. A dual-mode fluorescence/colorimetric sensor based on carbon quantum dots (CQDs) and gold nanoparticles (GNPs) was developed for visual detection of malathion in cabbage. The CQDs-GNPs nanocomposite exhibited emission wavelength at 527 nm and absorption wavelength at 524 nm. The fluorescence intensity increased and absorption decreased with addition of malathion. Fluorescence and colorimetric calibration curves were established based on fluorescence intensity (R2 = 0.9914) and absorbance (R2 = 0.9608) in the range of 1 × 10−9–1 × 10−2 M, respectively. Furthermore, fluorescence and colorimetric standard arrays were prepared for visual detection of malathion according to the change of fluorescence brightness and color. Finally, the approximate concentrations of malathion in cabbage samples were estimated by the standard arrays and naked eyes. The calibration curves were used for accurate detection in cabbage samples with recoveries of 89.9%–103.4% (fluorescence) and 88.7%–107.6% (colorimetric). The established sensor for visual malathion detection in cabbage was accurate with strong application potential, especially for rapid screening. [ABSTRACT FROM AUTHOR]