3-Aminopropyltrimethoxysilane Mediated Controlled Synthesis of Functional Noble Metal Nanoparticles and Its Multi-Metallic Analogues in the Presence of Small Organic Reducing Agents for Selective Application

MRS Advances ◽  
2018 ◽  
Vol 3 (15-16) ◽  
pp. 789-801
Author(s):  
Prem C. Pandey ◽  
Govind Pandey
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Metallic Nanoparticles ◽  
Present Report ◽  
Reducing Agents ◽  
Noble Metal Nanoparticles ◽  
Practical Significance ◽  
Similar Process ◽  
Controlled Synthesis ◽  
Polarity Index

ABSTRACTSynthesis of functional noble metal nanoparticles (AuNPs, AgNPs, and PdNPs) and its multi-metallic analogues have received greater attentions for selective applications. The selective applications of the these nanoparticles essentially requires the processability of as synthesized nanoparticles in the medium of desired polarity index that manifest the potential exploration of nanomaterial based design in targeted area. The use of conventional reducing and stabilizing agents during routine synthesis of such nanoparticles are not suitable with the system of practical significance and require additional reagents that limit the optimum activity of nanomaterial in targeted design. According there is a challenging issue in the synthesis of noble metal nanoparticles that allow the controlled synthesis of such nanoparticles involving same starting material with option to control the processability of as generated nanomaterial in the system of desired polarity index. The present report is focused on such challenging issues. We have found that 3-aminopropyltrimethoxysilane (3-APTMS) capped noble metal cations can be precisely converted into respective monometallic, bimetallic and trimetallic analogues and can be made processable in water at one end having controlled option to reversed the processability of the same in the toluene as a function of small organic reducing agents. The organic reducing agents not only convert 3-APTMS-capped noble cations into respective nanoparticles but also control the processability of the as generated nanoparticles in the systems of desired polarity index. The similar process also allows the synthesis of function bimetallic and tri-metallic nanoparticles. The role of cyclohexanone, formaldehyde and acetone in the presence of 3-APTMS is reported.

Synthesis and characterization of bimetallic noble metal nanoparticles for biomedical applications

MRS Advances ◽  
2016 ◽  
Vol 1 (11) ◽  
pp. 681-691 ◽  
Author(s):  
Prem C. Pandey ◽  
Govind Pandey
Keyword(s):  
Metal Ions ◽  
Prussian Blue ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Time Course ◽  
Bimetallic Nanoparticles ◽  
Reducing Agents ◽  
Noble Metal Nanoparticles ◽  
Ambient Conditions ◽  
Peroxidase Mimetic

ABSTRACTWe report herein a facile approach to synthesize processable bimetallic nanoparticles (Pd-Au/AuPd/Ag-Au/Au-Ag) decorated Prussian blue nanocomposite (PB-AgNP). The presence of cyclohexanone/formaldehyde facilitates the formation of functional bimetallic nanoparticles from 3-aminopropyltrimethoxysilane (3-APTMS) capped desired ratio of hetero noble metal ions. The use of 3-APTMS and cyclohexanone also enables the synthesis of polycrystalline Prussian blue nanoparticles (PBNPs). As synthesized PBNPs, Pd-Au/Au-Pd/Ag-Au/Au-Ag enable the formation of nano-structured composites displaying better catalytic activity than that recorded with natural enzyme. The nanomaterials have been characterized by Uv-Vis, FT-IR and Transmission Electron Microscopy (TEM) with following major findings: (1) 3-APTMS capped noble metal ions in the presence of suitable organic reducing agents i.e.; 3 glycidoxypropyltrimethoxysilane (GPTMS), cyclohexanone and formaldehyde; are converted into respective nanoparticles under ambient conditions, (2) the time course of synthesis and dispersibility of the nanoparticles are found as a function of organic reducing agents, (3) the use of formaldehyde and cyclohexanone in place of GPTMS with 3-APTMS outclasses the other two in imparting better stability of amphiphilic nanoparticles with reduced silanol content, (4) simultaneous synthesis of bimetallic nanoparticles under desired ratio of palladium/gold and silver/ gold cations are recorded, (5) the nanoparticles made from the use of 3-APTMS and cyclohexanone enable the formation of homogeneous nanocomposite with PBNP as peroxidase mimetic representing potential substitute of peroxidase enzyme. The peroxidase mimetic ability has been found to vary as a function of 3-APTMS concentration revealing the potential role of functional metal nanoparticles in bioanalytical applications.

Recent Advances in Shape-Controlled Synthesis of Noble Metal Nanoparticles by Radiolysis Route

nano Online ◽  
2017 ◽  
Author(s):  
Alam Abedini ◽  
Ahmad Ashrif A. Bakar ◽  
Farhad Larki ◽  
P. Susthitha Menon ◽  
Md. Shabiul Islam ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Noble Metal Nanoparticles ◽  
Controlled Synthesis ◽  
Recent Advances ◽  
Shape Controlled

scholarly journals Nanocatalysis by noble metal nanoparticles: controlled synthesis for the optimization and understanding of activities

2019 ◽  
Vol 7 (11) ◽  
pp. 5857-5874 ◽  
Author(s):  
Thenner S. Rodrigues ◽  
Anderson G. M. da Silva ◽  
Pedro H. C. Camargo
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Chemical Control ◽  
Noble Metal Nanoparticles ◽  
Controlled Synthesis ◽  
Physical Chemical ◽  
Catalytic Performances

This review discusses the importance of physical/chemical control in metallic NPs for the optimization and understanding of catalytic performances.

Shape- and size-controlled synthesis of noble metal nanoparticles

2014 ◽  
Vol 3 (4) ◽  
pp. 199-216 ◽  
Author(s):  
Kyeong Woo Choi ◽  
Do Youb Kim ◽  
Seong Ji Ye ◽  
O Ok Park
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Noble Metal Nanoparticles ◽  
Controlled Synthesis ◽  
Size Controlled ◽  
Shape And Size

scholarly journals Organotrialkoxysilane-Functionalized Noble Metal Monometallic, Bimetallic, and Trimetallic Nanoparticle Mediated Non-Enzymatic Sensing of Glucose by Resonance Rayleigh Scattering

Biosensors ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 122
Author(s):  
Prem C. Pandey ◽  
Murli Dhar Mitra ◽  
Shubhangi Shukla ◽  
Roger J Narayan
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Metallic Nanoparticles ◽  
Rayleigh Scattering ◽  
Metal Cations ◽  
Pd Nanoparticles ◽  
Glucose Sensing ◽  
Noble Metal Nanoparticles ◽  
Resonance Rayleigh Scattering ◽  
Gold Silver

Organotrialkoxysilanes like 3-aminopropyltrimethoxysilane (3-APTMS)-treated noble metal cations were rapidly converted into their respective nanoparticles in the presence of 3-glycidoxypropylytrimethoxysilane (3-GPTMS). The micellar activity of 3-APTMS also allowed us to replace 3-GPTMS with other suitable organic reagents (e.g., formaldehyde); this approach has significant advantages for preparing bimetallic and trimetallic analogs of noble metal nanoparticles that display efficient activity in many practical applications. The formation of monometallic gold, silver, and palladium nanoparticles, bimetallic Ag-Pd, and Au-Pd nanoparticles at various ratios of noble metal cations, and trimetallic Ag-Au-Pd nanoparticles were studied; their biocatalytic activity in non-enzymatic sensing of glucose based on monitoring synchronous fluorescence spectroscopy (SFS) was assessed. Of these nanoparticles, Au-Pd made with an 80:20 Au:Pd ratio displayed excellent catalytic activity for glucose sensing. These nanoparticles could also be homogenized with Nafion to enhance the resonance Rayleigh scattering (RRS) signal. In this study, the structural characterization of noble metal nanoparticles as well as bi- and tri-metallic nanoparticles in addition to their use in non-enzymatic sensing of glucose are reported.

Composites of silver nanoparticles and poly(vinylidene fluoride-trifluoroethylene)copolymer: Preparation as well as structural and electrical characterization

2009 ◽  
Vol 1182 ◽  
Author(s):  
Michael Wegener ◽  
Tonino Greco
Keyword(s):  
Silver Nanoparticles ◽  
Dielectric Properties ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Surface Plasmon ◽  
Metallic Nanoparticles ◽  
Photon Absorption ◽  
Noble Metal Nanoparticles ◽  
Pyroelectric Properties ◽  
Inorganic Particles

AbstractComposites comprising of polymers and metal nanoparticles are of great interest in regard to electronic and opto-electronic applications. The preparation of such nanocomposites with homogenously dispersed particles usually cannot be solved by mixing the polymer and the desired isolated colloids due to strong agglomeration tendency of the metallic nanoparticles. Consequently, nanocomposites with colloids have been prepared by synthesis of the inorganic particles in situ, for instance in solution, and then mixed with the polymer solution.Extensive attention has been given to the study of the plasmonic properties of noble metal nanoparticles as a result of their potential application as waveguides, photonic circuits, and sensors [1]. Surface plasmon polaritons are excited when electromagnetic radiation causes coherent oscillations of the conducting electrons of noble metal nanoparticles such as gold, silver or copper. The selective photon absorption and scattering allow the monitoring of the optical properties of the nanoparticles by conventional spectroscopic methods like UV-vis spectroscopy. Previous investigations show that the surface plasmon resonance frequency is extremely sensitive to the size, shape, and the surrounding dielectric environment of the nanoparticles [2].In order to obtain multifunctional composites electro-active polymers (EAP) can be chosen as matrix materials. EAPs such as polyvinylidene fluoride (PVDF) and its copolymer with trifluoroethylene (P(VDF-TrFE)) show a ferroelectric polarization accompanied with piezo- and pyroelectric properties. Both polymers are suitable for composite preparation as earlier studies have shown, e.g. performed on ceramic-polymer composites in order to optimize their piezo- and pyroelectric properties and to adjust their dielectric properties, respectively. Recently, PVDF with embedded metallic nanoparticles was studied regarding the kinetics of film preparation, dispersion and resulting properties [3].In this work, the influence of homogenously dispersed silver-nanoparticles in electro-active polymers such as PVDF and P(VDF-TrFE) has been investigated over a broad range of mass fractions of silver. For low silver nanoparticle content (up to 3wt.%) the surface plasmon polariton resonance peak can be observed in the blue spectral region. From the infrared spectra it is concluded that no significant degradation of the polymers occurs. Higher silver amounts cause the formation of fractal-like agglomerates. Thus, a high extinction cross section in the visible and infrared spectral range is found. Furthermore, the influence of the silver mass fraction to the thermal, electrical and dielectric properties of the nanocomposites is discussed in detail.[1] S. A. Maier, H. A. Atwater, J. Appl. Phys. 2005, 98, 011101-10. [2] J. J. Mock, et al, J. Chem. Phys. 2002, 116, 6755-6759.[3] J. Compton, et al, Makromol. Symp. 2007, 247, 182-189.

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