Preparation of acacia‐stabilized silver nanoparticles: A green approach

Mohan, Y. Murali; Raju, K. Mohana; Sambasivudu, K.; Singh, Satyendra; Sreedhar, B.

doi:10.1002/app.26979

Cited by 135 publications

(70 citation statements)

References 58 publications

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“…Such concentration-dependent behavior of AgNO 3 and reducing agent (ginseng in this case) in relation to the synthesis of AgNPs is in good agreement with previous reports. (14,31,32) …”

Section: Synthesis Of Agnpmentioning

confidence: 99%

“…Similarly, the green or environment-friendly synthesis of silver nanoparticles (AgNPs) has been reported using seed/plant extracts, microorganisms, plant latex, and biopolymers. (11)(12)(13)(14) The quest for finding other effective and user-friendly route/source of green synthesis/material made researchers find and explore other plants that have medicinal values.…”

Section: Introductionmentioning

confidence: 99%

“…Such concentration-dependent behavior of AgNO 3 and the reducing agent (ginseng in this case) is in good agreement with previous reports. (14,31,32) At higher concentrations of the root extract, the rate of nanoparticle synthesis was found to be excellent owing to the adequate availability of the reducing/capping agent for the efficient reduction of Ag + to Ag 0 . Similar observations were noted for the other biomaterials that are acting both as a reducing agent and a capping agent.…”

mentioning

confidence: 99%

“…Similar observations were noted for the other biomaterials that are acting both as a reducing agent and a capping agent. (10,14) Figure 2(c) shows the absorption spectra in the UV-vis range for AgNPs synthesized with 0.2% root extract and 1 mM AgNO 3 in different proportions (v/v). An increase in surface plasmon absorption peak intensity with the increase in the proportion (v/v) of the root extract was observed since the amount of root powder in the total volume of the reaction mixture increases.…”

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confidence: 99%

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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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“…Such concentration-dependent behavior of AgNO 3 and reducing agent (ginseng in this case) in relation to the synthesis of AgNPs is in good agreement with previous reports. (14,31,32) …”

Section: Synthesis Of Agnpmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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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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“…S9, Table S1). Shift in the absorbance peaks from 1426 to 1398 cm 21 suggests the binding of Ag ions with carbonyl groups of GG 55 . However, the shift in the alcoholic groups (1046 to 1024 cm 21 ) suggest the reduction of the silver ions by the oxidation of the hydroxyl and carbonyl groups.…”

Section: Methodsmentioning

confidence: 99%

Nanocomposite based flexible ultrasensitive resistive gas sensor for chemical reactions studies

pandey¹,

Pandey²,

Goswami³

et al. 2013

Protocol Exchange

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Room temperature operation, low detection limit and fast response time are highly desirable for a wide range of gas sensing applications. However, the available gas sensors suffer mainly from high temperature operation or external stimulation for response/recovery. Here, we report an ultrasensitive-flexiblesilver-nanoparticle based nanocomposite resistive sensor for ammonia detection and established the sensing mechanism. We show that the nanocomposite can detect ammonia as low as 500 parts-per-trillion at room temperature in a minute time. Furthermore, the evolution of ammonia from different chemical reactions has been demonstrated using the nanocomposite sensor as an example. Our results demonstrate the proof-of-concept for the new detector to be used in several applications including homeland security, environmental pollution and leak detection in research laboratories and many others.A mmonium nitrate is present in many explosives and is known to gradually decompose and release trace amounts of ammonia. It is, therefore, essential to detect a trace of the gas to prevent the fatal accidents. The variation of conductivity of metal oxides and conducting polymers has been explored for the detection of ammonia in ppb (parts-per-billion) range. The conventional solid state and conducting polymer sensors suffer from ultralow detection at room temperature . The commercially available conducting polymer sensors require high power consumption since they provide adequate sensitivity only at high temperatures. Intense research is underway to develop new sensing materials and devices for a wide range of applications, especially, at room temperature. It has been shown that the graphene and carbon nanotube based detectors can operate at room temperature [27][28][29][30][31][32] . However, it is required to supply air or oxygen along with ammonia and apply either a current of 100 mA or UV illumination in order to clean the adsorbed gas molecules for sensor recovery [27][28][29][30][31][32] . A self-activated highly sensitive graphene 32 or metal oxide nanostructures 33 have been reported where the response time is few minutes.An ideal sensor should possess the following significant features: (i) operation at room temperature; (ii) working in ambient environment and no requirement of oxygen or air supply; (iii) no external stimulus such as Joule heating or UV illumination for response/recovery; (iv) low detection limit; (v) high sensitivity and reproducibility; (vi) fast response and recovery; (vii) low cost and eco-friendly, etc. We have previously reported the aqueous ammonia sensing of guar gum/silver nanoparticles (GG/Ag) solutions based on the variation of the surface plasmon resonance (SPR) peaks 34 . Limitations of the method are that the solution cannot be reused and the detection limit is ppm level. Here, we report an ultrasensitive chemiresistor sensor based on GG/Ag nanocomposite for ammonia detection. The conductance of the sensor increases and the change is shown to be improved by increasing the loading of Ag n...

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Advances in Sensors' Nanotechnology

Tiwari

Singh

2014

Advanced Sensor and Detection Materials

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Preparation of acacia‐stabilized silver nanoparticles: A green approach

Cited by 135 publications

References 58 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+

Nanocomposite based flexible ultrasensitive resistive gas sensor for chemical reactions studies

Advances in Sensors' Nanotechnology

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