title: Decorating CdTe QD-Embedded Mesoporous Silica Nanospheres with Ag NPs to Prevent Bacteria Invasion for Enhanced Anticounterfeit Applications.
abstract: Quantum dots (QDs) as potent candidates possess advantageous superiority in fluorescence imaging applications, but they are susceptible to the biological circumstances (e.g., bacterial environment), leading to fluorescence quenching or lose of fluorescent properties. In this work, CdTe QDs were embedded into mesoporous silica nanospheres (m-SiO2 NSs) for preventing QD agglomeration, and then CdTe QD-embedded m-SiO2 NSs (m-SiO2/CdTe NSs) were modified with Ag nanoparticles (Ag NPs) to prevent bacteria invasion for enhanced anticounterfeit applications. The m-SiO2 NSs, which serve as intermediate layers to combine CdTe QDs with Ag NPs, help us establish a highly fluorescent and long-term antibacterial system (i.e., m-SiO2/CdTe/Ag NSs). More importantly, CdTe QD-embedded m-SiO2 NSs showed fluorescence quenching when they encounter bacteria, which was avoided by attaching Ag NPs outside. Ag NPs are superior to CdTe QDs for preventing bacteria invasion because of the structure (well-dispersed Ag NPs), size (small diameter), and surface charge (positive zeta potentials) of Ag NPs. The plausible antibacterial mechanisms of m-SiO2/CdTe/Ag NSs toward both Gram-positive and Gram-negative bacteria were established. As for potential applications, m-SiO2/CdTe/Ag NSs were developed as fluorescent anticounterfeiting ink for enhanced imaging applications.
authors.forename: Yangyang
authors.initials: Y
authors.lastname: Gao
authors.forename: Qigeqi
authors.initials: Q
authors.lastname: Dong
authors.affiliation: ⊥College of Science, Inner Mongolia Agricultural University, Hohhot 010018, People's Republic of China.
authors.forename: Shi
authors.initials: S
authors.lastname: Lan
authors.forename: Qian
authors.initials: Q
authors.lastname: Cai
authors.affiliation: ||Département de Chimie, Faculté Des Sciences (FDS), Université de Lomé (UL), BP 1515 Lome, Togo.
authors.forename: Oudjaniyobi
authors.initials: O
authors.lastname: Simalou
authors.affiliation: #PhD School of Materiaux, Mechanics, Environnement, Energy, Process and Production Engineering (I-MEP2), University of Grenoble, Grenoble 38031, France.
authors.forename: Shiqi
authors.initials: S
authors.lastname: Zhang
authors.affiliation: △College of Chemistry, Jilin University, Changchun 130021, People's Republic of China.
authors.forename: Ge
authors.initials: G
authors.lastname: Gao
authors.forename: Harnoode
authors.initials: H
authors.lastname: Chokto
authors.forename: Alideertu
authors.initials: A
authors.lastname: Dong
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects*; D019187:Cadmium Compounds / Q000494:pharmacology*; D004926:Escherichia coli / Q000187:drug effects / Q000648:ultrastructure; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008826:Microbial Sensitivity Tests; D008856:Microscopy, Fluorescence; D054118:Nanospheres / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D016062:Porosity; D045663:Quantum Dots / Q000737:chemistry*; D012822:Silicon Dioxide / Q000494:pharmacology*; D012834:Silver / Q000494:pharmacology*; D013211:Staphylococcus aureus / Q000187:drug effects / Q000648:ultrastructure; D013691:Tellurium / Q000494:pharmacology*; D014466:Ultraviolet Rays; D014961:X-Ray Diffraction
chemical_list: D000900:Anti-Bacterial Agents; D019187:Cadmium Compounds; D012834:Silver; D012822:Silicon Dioxide; D013691:Tellurium; C028337:cadmium telluride
keywords: Ag NPs; CdTe QDs; antibacterial; anticounterfeit; fluorescent; mesoporous SiO2