Long‐Term Antimicrobial Effect of Silicon Nanowires Decorated with Silver Nanoparticles

Lv, Min; Su, Shao; He, Yao; Huang, Qing; Hu, Wenbing; Li, Di; Fan, Chunhai; Lee, Shuit‐Tong

doi:10.1002/adma.201001934

Cited by 245 publications

(179 citation statements)

References 36 publications

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“…In contrast, marked enhancements in bactericidal efficiency were observed on the Ag 3 PO 4 -(curve c) presence (curve d) and absence (curve e) of visible-light irradiation, it is evident that, apart from the effect of the silver ions, a large part of the bactericidal effects is related to the photocatalytic process. 39 Stability and reusability are also two major challenges in employing photocatalytic materials for antimicrobial applications. To evaluate the antimicrobial stabilities of the as-formed nanocomposites, we further studied the inactivation of Ag 3 PO 4 -, TiO 2 -, and Ag 3 PO 4 /TiO 2 /Fe 3 O 4 -based antibacterial films for several bactericidal cycles.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Magnetically Separable Ag₃PO₄/TiO₂/Fe₃O₄ Heterostructure with Enhanced Photocatalytic Performance under Visible Light for Photoinactivation of Bacteria

Gao

Han

et al. 2014

ACS Appl. Mater. Interfaces

198

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Silver orthophosphate (Ag3PO4) is a low-band-gap photocatalyst that has received considerable research interest in recent years. In this work, the magnetic Ag3PO4/TiO2/Fe3O4 heterostructured nanocomposite was synthesized. The nanocomposite was found to exhibit markedly enhanced photocatalytic activity, cycling stability, and long-term durability in the photodegradation of acid orange 7 (AO7) under visible light. Moreover, the antibacterial film prepared from Ag3PO4/TiO2/Fe3O4 nanocomposite presented excellent bactericidal activity and recyclability toward Escherichia coli (E. coli) cells under visible-light irradiation. In addition to the intrinsic cytotoxicity of silver ions, the elevated bactericidal efficiency of Ag3PO4/TiO2/Fe3O4 can be largely attributed to its highly enhanced photocatalytic activity. The photogenerated hydroxyl radicals and superoxide ions on the formed Ag/Ag3PO4/TiO2 interfaces cause considerable morphological changes in the microorganism's cells and lead to the death of the bacteria.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Magnetically Separable Ag₃PO₄/TiO₂/Fe₃O₄ Heterostructure with Enhanced Photocatalytic Performance under Visible Light for Photoinactivation of Bacteria

Gao

Han

et al. 2014

ACS Appl. Mater. Interfaces

198

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“…34 Pure Ag NPs have been reported to easily oxidize and aggregate in air, which oen leads to significant reduction of antibacterial activity. 36 We then performed the stability test using Ag NPs and Au@Ag-2 NPs, two types of NPs were stored in light for 2 days and the UV-Vis spectra were measured. It can be noticed that the absorption peak of Ag NPs at 400 nm shied to 417 nm with a large decrease in intensity, suggesting aggregation of Ag NPs (Fig.…”

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confidence: 99%

Shell thickness-dependent antibacterial activity and biocompatibility of gold@silver core–shell nanoparticles

et al. 2017

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Antimicrobial activity of silver is highly effective and broad-spectrum; however, poor long-term antibacterial efficiency and cytotoxicity toward mammalian cells have restricted their applications. Here, we fabricated Au@Ag NPs with tailored shell thickness, and investigated their antibacterial activities against both Gram-negative bacteria (Escherichia coli) and Gram-positive bacteria (Staphylococcus aureus) and the cytotoxicity toward SH-SY5Y human cells, for the first time. Our results demonstrate that Au@Ag NPs with a thickness of 5 nm or Au : Ag ratio 1 : 1 (Au@Ag-2 NPs) have the highest antibacterial activity and excellent biocompatibility. The minimum inhibitory concentration (MIC) values of Au@Ag-2 NPs in terms of effective silver concentration are 5 mg mL À1 for E. coli and 7.5 mg mL À1 for S. aureus, IntroductionTo cope with the overwhelming challenges of infectious diseases resulting from pathogenic bacteria, nano-sized materials, emerging as new types of safe and cost-effective bactericidal materials, have been widely investigated. Among those numerous nanomaterials, silver nanoparticles (Ag NPs) are the most promising antibacterial agents because of their inherent properties of high thermal stability, limited microbial resistance, and broad-spectrum antimicrobial activity against bacteria, viruses and other eukaryotic microorganisms. 1-4 Sondi and co-workers 5 demonstrated that Ag NPs can easily adsorb to the membrane surface of bacteria through electrostatic interaction, form permeable pits, and cause an osmotic collapse in the cells. The other possible mechanism is the release of silver ions (Ag + ) from the oxidized Ag NPs. 6-8 Ag NPs are easy to oxidize and produce a high concentration of Ag + , the released Ag + then destroys the respiratory chain and leads to the formation of reactive oxygen species (ROS), such as hydroxyl radicals, H 2 O 2 and hydroperoxyl radicals, which nally trigger cell damage of the cellular components and leads to the death of the bacteria. 9-11 In spite of this, the easy oxidation of pure Ag NPs and the toxicity in mammalian cells remain challenges in Ag NP applications. 12-14To address this problem, Ag NPs have been decorated with other nanomaterials by the formation of nanostructures. Song et al. 15synthesized the silver/polyrhodanine compositedecorated silica nanoparticles, which exhibited excellent antimicrobial activity toward Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) because of the antibacterial effects of both the silver nanoparticles and the polyrhodanine. Tan et al. 16synthesized antibacterial Ag@dsDNA@GO, which can wrap around the Xanthomonas perforans cell and results in rapid cell apoptosis, showing the synergistic antibacterial effect. While these nanostructures can effectively enhance the antibacterial activity of Ag NPs, they oen require complex and tedious preparation methods, and suffering from low yields, poor longterm antibacterial activity, and biocompatibility problems. 17,18Bimetallic core-shell nanoparticles are graduall...

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“…The antibacterial effects of Ag-based NWs (Holtz et al 2010(Holtz et al , 2012Jiang et al 2012;Liu et al 2013;Schoen et al 2010;Singh et al 2014;Tamboli et al 2012;Tang et al 2014;Visnapuu et al 2013;Zhang et al 2007), Si NWs (Lv et al 2010), ZnO NWs (Kılıç and Omay 2014;Wu et al 2011), MgO NWs (AlHazmi et al 2012, Mn 2 O 3 NWs (Hassan et al 2012), Tibased NWs (Nataraj et al 2014;Shang et al 2010), and CdO NWs (Kumar and Ojha 2013) were evaluated. Test subjects included the pathogenic bacteria species Escherichia coli, Bacillus subtilis, Staphylococcus aureus, …”

Section: Toxicity Of Nanowires To Bacteriamentioning

confidence: 99%

A review of the ecotoxicological effects of nanowires

Kwak

2014

Int. J. Environ. Sci. Technol.

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We briefly reviewed the existing research on the ecotoxicity of nanowires and suggested directions for further study. Nanowires are technological innovations that can benefit humans. However, it is important to consider the effects of nanowires on the environment. Only a few studies have reported acute and chronic ecological toxicity of nanowires on aquatic and terrestrial organisms, and limited research papers have reported antibacterial effects of nanowires. It is assumed that nanowires have a toxic mechanism similar to that of nanoparticles or ions, but the mechanism remains unknown because so little research has been conducted on the ecological toxicity of nanowires. More in-depth assessments of the chronic toxicity, bioavailability, cytotoxicity, and genotoxicity of nanowires on various species are needed.

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Long‐Term Antimicrobial Effect of Silicon Nanowires Decorated with Silver Nanoparticles

Cited by 245 publications

References 36 publications

Synthesis of Magnetically Separable Ag₃PO₄/TiO₂/Fe₃O₄ Heterostructure with Enhanced Photocatalytic Performance under Visible Light for Photoinactivation of Bacteria

Synthesis of Magnetically Separable Ag₃PO₄/TiO₂/Fe₃O₄ Heterostructure with Enhanced Photocatalytic Performance under Visible Light for Photoinactivation of Bacteria

Shell thickness-dependent antibacterial activity and biocompatibility of gold@silver core–shell nanoparticles

A review of the ecotoxicological effects of nanowires

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Long‐Term Antimicrobial Effect of Silicon Nanowires Decorated with Silver Nanoparticles

Cited by 245 publications

References 36 publications

Synthesis of Magnetically Separable Ag3PO4/TiO2/Fe3O4 Heterostructure with Enhanced Photocatalytic Performance under Visible Light for Photoinactivation of Bacteria

Synthesis of Magnetically Separable Ag3PO4/TiO2/Fe3O4 Heterostructure with Enhanced Photocatalytic Performance under Visible Light for Photoinactivation of Bacteria

Shell thickness-dependent antibacterial activity and biocompatibility of gold@silver core–shell nanoparticles

A review of the ecotoxicological effects of nanowires

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Synthesis of Magnetically Separable Ag₃PO₄/TiO₂/Fe₃O₄ Heterostructure with Enhanced Photocatalytic Performance under Visible Light for Photoinactivation of Bacteria

Synthesis of Magnetically Separable Ag₃PO₄/TiO₂/Fe₃O₄ Heterostructure with Enhanced Photocatalytic Performance under Visible Light for Photoinactivation of Bacteria