Biopolymer capped silver nanoparticles with potential for multifaceted applications

Vanamudan, Ageetha; Sudhakar, P.

doi:10.1016/j.ijbiomac.2016.01.056

Cited by 51 publications

(13 citation statements)

References 37 publications

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“…A broad O-H band was observed for AgNPs synthesized with ginseng in comparison with that of ginseng (without AgNPs), which can be attributed to the interaction of the AgNPs with the hydroxyl groups of the biomolecules present in the ginseng root powder. (37,38) The FTIR spectra of the ginseng showed a peak at 211 1740 cm −1 , due to the carbonyl stretching vibrations of the aldehyde. (12,39) The decrease in peak intensity at 1740 cm −1 and the increase in peak intensity at 1640 and 1407 cm −1 (for symmetric and asymmetric -COO stretching vibrations, respectively) of ginseng-stabilized AgNPs indicate the significant role of -CHO in the reduction of Ag + .…”

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confidence: 99%

Green Synthesis of Silver Nanoparticles Using Panax Ginseng Root Extract for the Detection of Hg2+

Tagad¹,

Hyun²,

Rucha³

et al. 2017

Sensors and Materials

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Exploring biomaterials/molecules as a reducing/capping agent for the synthesis of metal nanoparticles has set a new trend in green nanotechnology with improved environmental safety. Herein, a facile, one-pot, and green synthesis of silver nanoparticles (AgNPs) was achieved using Panax ginseng root extract that was obtained from the root powder as a cost-effective and environmentfriendly biomaterial. Optical, functional, and morphological characteristics of the synthesized AgNPs were determined using ultraviolet-visible (UV-vis), Fourier transform infrared (FTIR) spectrophotometers, transmission electron microscopy (TEM), and atomic force microscopy (AFM). The synthesized AgNPs were used for the detection of Hg 2+ by obtaining the absorption spectrum of the compound as a function of Hg 2+ concentration, which resulted in a decrease in absorption peak intensity with a slight blue shift. The AgNP solution decolored upon dissolution due to the formation of an Ag-Hg amalgam. The sensing characteristics were found to be linear when tested from 10 µM to 1 mM Hg 2+ concentration and the detection limit was estimated as 5 µM. To check the selectivity of the sensor towards Hg 2+ , the sensor response was measured for different heavy metals such as K + , Na + , Cu 2+ , Ni 2+ , Ca 2+ , Zn 2+ , Mg 2+ , and Mn 2+ , at 10 mM concentrations.

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confidence: 99%

Green Synthesis of Silver Nanoparticles Using Panax Ginseng Root Extract for the Detection of Hg2+

Tagad¹,

Hyun²,

Rucha³

et al. 2017

Sensors and Materials

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“…Next, we analyzed the formation mechanism of the Cu 2 O/Au NSs. Cu 2 O can directly reduce AuCl 4 – at room temperature because the standard reduction potential of Cu 2+ /Cu 2 O is 0.203 V and the standard reduction potential of AuCl 4 – /Au is 1.002 V. 32 , 33 In consequence, the following reaction occurs 36 …”

Section: Resultsmentioning

confidence: 99%

Remarkable SERS Detection by Hybrid Cu₂O/Ag Nanospheres

et al. 2020

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Cu 2 O nanospheres (NSs) were synthesized by modifying the glucose reduction method. Based on this method, Cu 2 O/Au (Ag) NSs were further prepared by in situ reduction of HAuCl 4 (via electron beam evaporation of Ag). With Rhodamine 6G (R6G) as probe, the surface-enhanced Raman scattering (SERS) characteristics of the three samples were systematically studied. The experiment results showed that the enhancement factor (EF) of Cu 2 O/Au (Ag) NSs as 1.25 × 10 8 (2.74 × 10 9 ) and the ultralow detection limit (LOD) as 8.07 × 10 –12 (1.13 × 10 –13 ) M for R6G. The excellent performance of SERS may be due to the charge transfer (CT) between metal–semiconductor (MS) molecules and the strong electromagnetic field (E-field) of each hot spot. In addition, discrete dipole approximation (DDA) simulations were performed to simulate the E-field enhancement of the Cu 2 O and Cu 2 O/Au (Ag) NSs in a three-dimensional (3D) configuration. These further supported that the high SERS performance for R6G is because of the powerful E-field coupling between neighboring Au (Ag) NPs and the surface plasmon resonance (SPR) effect. The Cu 2 O/Ag NSs have potential in applications such as biomedicine, food safety, and environmental monitoring because of their high sensitivity and good reproducibility.

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“…However, SAED is proven to be a more prominent technique in the analysis of the biopolymer-assisted synthesis of metallic nanoparticles [22,23,[188][189][190][191]; SAED analysis of biopolymer gum guar capped silver nanoparticles revealed information about the crystalline structure of the nanoparticles. The diffraction pattern ( Figure 12) consisted of concentric rings with bright dots, which suggests that the synthesized particles are highly crystalline in nature; the rings were further assigned to (111), (200), (220), and (311) planes of the face-centered cubic structure of the particles [192].…”

Section: Transmission Electron Microscopymentioning

confidence: 99%

“…TEM micrograph of (a) guar gum capped silver nanoparticles; (b) selected area electron diffraction (SAED) pattern[192]. (Reprinted with permission fromVanamudan et al, 2016. ) …”

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Microscopic Techniques for the Analysis of Micro and Nanostructures of Biopolymers and Their Derivatives

et al. 2020

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Natural biopolymers, a class of materials extracted from renewable sources, is garnering interest due to growing concerns over environmental safety; biopolymers have the advantage of biocompatibility and biodegradability, an imperative requirement. The synthesis of nanoparticles and nanofibers from biopolymers provides a green platform relative to the conventional methods that use hazardous chemicals. However, it is challenging to characterize these nanoparticles and fibers due to the variation in size, shape, and morphology. In order to evaluate these properties, microscopic techniques such as optical microscopy, atomic force microscopy (AFM), and transmission electron microscopy (TEM) are essential. With the advent of new biopolymer systems, it is necessary to obtain insights into the fundamental structures of these systems to determine their structural, physical, and morphological properties, which play a vital role in defining their performance and applications. Microscopic techniques perform a decisive role in revealing intricate details, which assists in the appraisal of microstructure, surface morphology, chemical composition, and interfacial properties. This review highlights the significance of various microscopic techniques incorporating the literature details that help characterize biopolymers and their derivatives.

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Biopolymer capped silver nanoparticles with potential for multifaceted applications

Cited by 51 publications

References 37 publications

Green Synthesis of Silver Nanoparticles Using Panax Ginseng Root Extract for the Detection of Hg2+

Green Synthesis of Silver Nanoparticles Using Panax Ginseng Root Extract for the Detection of Hg2+

Remarkable SERS Detection by Hybrid Cu₂O/Ag Nanospheres

Microscopic Techniques for the Analysis of Micro and Nanostructures of Biopolymers and Their Derivatives

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Biopolymer capped silver nanoparticles with potential for multifaceted applications

Cited by 51 publications

References 37 publications

Green Synthesis of Silver Nanoparticles Using Panax Ginseng Root Extract for the Detection of Hg2+

Green Synthesis of Silver Nanoparticles Using Panax Ginseng Root Extract for the Detection of Hg2+

Remarkable SERS Detection by Hybrid Cu2O/Ag Nanospheres

Microscopic Techniques for the Analysis of Micro and Nanostructures of Biopolymers and Their Derivatives

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Remarkable SERS Detection by Hybrid Cu₂O/Ag Nanospheres