Aggregation induced, formaldehyde tailored nanowire like networks of Cu and their SERS activity

Athira, K.; Ranjana, M.; Bharathi, M.; Reddy, B. Narasimha; Babu, T G Satheesh; Rao, S. Venugopal; Kumar, Darbha V. Ravi

doi:10.1016/j.cplett.2020.137390

Cited by 13 publications

(5 citation statements)

References 29 publications

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“…As an antibacterial agent, copper oxide (CuO) has been used for a long time [8]. In addition to its antimicrobial activity, CuO has also been employed for water treatment, food packaging, and other industrial applications [9,10]. According to studies, CuO has a potent antibacterial impact not only on bacteria but also on viruses, and fungi.…”

Section: Introductionmentioning

confidence: 99%

Biosurfactant-capped CuO nanoparticles coated cotton/polypropylene fabrics toward antimicrobial textile applications

Haripriya,

Revathy,

Kumar

et al. 2024

Nanotechnology

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The global COVID-19 pandemic has led to an increase in the importance of implementing effective measures to prevent the spread of microorganisms. Consequently, there is a growing demand for antimicrobial materials, specifically antimicrobial textiles and face masks, because of the surge in diseases caused by bacteria and viruses like SARS-CoV-2. Face masks that possess built-in antibacterial properties can rapidly deactivate microorganisms, enabling reuse and reducing the incidence of illnesses. Among the numerous types of inorganic nanomaterials, copper oxide nanoparticles (CuO NPs) have been identified as cost-effective and highly efficient antimicrobial agents for inactivating microbes. Furthermore, biosurfactants have recently been recognized for their potential antimicrobial effects, in addition to inorganic nanoparticles. Therefore, this research's primary focus is synthesizing biosurfactant-mediated CuO NPs, integrating them into natural and synthetic fabrics such as cotton and polypropylene and evaluating the resulting fabrics' antimicrobial activity. Using rhamnolipid (RL) as a biosurfactant and employing a hydrothermal method with a pH range of 9-10, RL capped CuO NPs are synthesized (RL-CuO NPs). To assess their effectiveness against gram-positive (Staphylococcus aureus) and gram-negative (Escherichia coli) microorganisms, the RL-CuO NPs are subjected to antibacterial testing. The RL-capped CuO NPs exhibited antimicrobial activity at much lower concentrations than the individual RL, CuO. RL-CuO NPs have shown a minimum inhibitory concentration (MIC) of 1.2 mg/mL and minimum bactericidal concentration (MBC) of 1.6 mg/mL for E. coli and a minimum inhibitory concentration (MIC) of 0.8 mg/mL and a minimum bactericidal concentration (MBC) of 1.2 mg/mL for S. aureus, respectively. Furthermore, the developed RL-CuO NPs are incorporated into cotton and polypropylene fabrics using a screen-printing technique. Subsequently, the antimicrobial activity of the coated fabrics is re-evaluated, revealing that RL CuO NPs coated fabrics exhibited remarkable antibacterial properties against both gram-positive and gram-negative bacteria.

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Section: Introductionmentioning

confidence: 99%

Biosurfactant-capped CuO nanoparticles coated cotton/polypropylene fabrics toward antimicrobial textile applications

Haripriya,

Revathy,

Kumar

et al. 2024

Nanotechnology

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“…Copper nanoparticles also exhibit plasmonic properties, although typically in the near-infrared (NIR) range, which may be a drawback for certain applications. Furthermore, copper is more susceptible to oxidation and surface contamination, which may affect the reproducibility and stability of the measurements [33]. On the other hand, silver nanoparticles exhibit the highest enhancement factors among the three noble metals and are frequently used for the detection of biomolecules, including proteins, nucleic acids, and small molecules, in complex biological samples such as blood, urine, and tissues, despite also being prone to oxidation [34].…”

Section: Introductionmentioning

confidence: 99%

Superoxide Dismutase Detection on Silver Nanostructured Substrates through Surface-Enhanced Spectroscopic Techniques

Kanioura,

Geka,

Kochylas

et al. 2024

Chemosensors

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Oxidative stress refers to the overproduction of reactive oxygen species and is often associated with numerous pathological conditions. Superoxide dismutase (SOD) is a widely used enzyme for evaluating oxidative stress, with numerous methods being developed for its detection in biological specimens like blood, urine, and saliva. In this study, a simple metal-assisted chemical etching method was employed for the fabrication of nanostructured silicon surfaces decorated with either silver dendrites or silver aggregates. Those surfaces were used as substrates for the immunochemical determination of SOD in synthetic saliva through surface-enhanced Raman spectroscopy (SERS) and surface-enhanced fluorescence (SEF). The immunoassay was based on a 3-step competitive assay format, which included, after the immunoreaction with the specific anti-SOD antibody, a reaction with a biotinylated secondary antibody and streptavidin. Streptavidin labeled with peroxidase was used in combination with a precipitating tetramethylbenzidine substrate for detection through SERS, whereas for SEF measurements, streptavidin labeled with the fluorescent dye Rhodamine Red-X was utilized. Both immunoassays were sensitive, with a detection limit of 0.01 μg/mL and a linear dynamic range from 0.03 to 3.3 μg/mL, enabling the evaluation of the oxidative stress status of an organism.

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“…Hence, a potential alternative to replace the hydrazine for the Cu nanowires synthesis and yet give good quality nanowires is required. This requirement led to exploration of some novel, simple, green protocols for synthesizing Cu nanowires [16–18] . Although these molecules successfully result in interesting Cu nanostructures, they could not yield nanowires as the main product.…”

Section: Introductionmentioning

confidence: 99%

“…This requirement led to exploration of some novel, simple, green protocols for synthesizing Cu nanowires. [16][17][18] Although these molecules successfully result in interesting Cu nanostructures, they could not yield nanowires as the main product. In the process of identification of suitable reagents to replace toxic and highly flammable hydrazine, the potentiality of ascorbic acid in the synthesis of various nano-materials has been noticed.…”

Section: Introductionmentioning

confidence: 99%

Ethylenediamine Mediated, Environmentally Benign Synthesis of Copper Nanowires and their Catalytic Activity Towards 4‐Nitrophenol Reduction

Ranjana

Sahu²,

Ramesh

et al. 2023

ChemistrySelect

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Due to their unique characteristics, one‐dimensional copper (Cu) nanowires are being explored for various applications, including optoelectronics, chemical sensing, catalysis, electrocatalysis, etc. Cu is more affordable and accessible than other noble metals, making it a desirable replacement. Cu nanowires are predominantly synthesized using ethylenediamine (EDA) mediated procedure, in which hydrazine is used as a reducing agent. This method does not require high temperatures and produces good‐quality nanowires within an hour. However, the toxicity of hydrazine limits the large‐scale synthesis of wires using this cost‐effective method, inspite of its advantages mentioned above. Hence, this article aimed to replace the toxic hydrazine with environmentally benign ascorbic acid in EDA‐mediated procedures. Such green synthesis using ascorbic acid successfully yielded Cu nanowires. As revealed by TEM analysis, these Cu nanowires evolved from micron‐sized aggregates of ultra‐small particles. Due to the capping action of EDA, nanowires evolved from the micron‐sized aggregates of ultra‐small particles and resulted in particles attached nanowires (at one end of the nanowires) with a clear particle‐wire interface. Environmentally benign synthesized Cu nanowires are examined as catalysts for the remediation of environmental organic pollutant, i. e., 4‐nitrophenol (4‐NP). Towards the reduction of 4‐NP, green synthesized Cu nanowires have shown on‐par activity with earlier reported catalysts.

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Aggregation induced, formaldehyde tailored nanowire like networks of Cu and their SERS activity

Cited by 13 publications

References 29 publications

Biosurfactant-capped CuO nanoparticles coated cotton/polypropylene fabrics toward antimicrobial textile applications

Biosurfactant-capped CuO nanoparticles coated cotton/polypropylene fabrics toward antimicrobial textile applications

Superoxide Dismutase Detection on Silver Nanostructured Substrates through Surface-Enhanced Spectroscopic Techniques

Ethylenediamine Mediated, Environmentally Benign Synthesis of Copper Nanowires and their Catalytic Activity Towards 4‐Nitrophenol Reduction

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