scholarly journals Planar Non-Volatile Memory based on Metal Nanoparticles

2011 ◽  
Vol 1337 ◽  
Author(s):  
A. Kiazadeh ◽  
H. L. Gomes ◽  
A. R. Da Costa ◽  
P. Rocha ◽  
Q. Chen ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Charge Transport ◽  
Metal Nanoparticles ◽  
Resistive Switching ◽  
Polymer Matrix ◽  
Resistance Ratio ◽  
Gold Electrodes ◽  
Temperature Dependent ◽  
Metallic Filament ◽  
Non Volatile Memory

ABSTRACTResistive switching properties of silver nanoparticles hosted in an insulating polymer matrix (poly(N-vinyl-2-pyrrolidone) are reported. Planar devices structures using interdigitated gold electrodes were fabricated. These devices have on/off resistance ratio as high as 103 , retention times reaching to months and good endurance cycles. Temperature-dependent measurements show that the charge transport is weakly thermal activated (73 meV) for both states suggesting that nanoparticles will not aggregate into a metallic filament.

A persistently increasing resistance ratio and repeatable non-volatile memory in AZO/CZTSe/FTO resistive switching devices

2018 ◽  
Vol 11 (02) ◽  
pp. 1850023 ◽  
Author(s):  
Pingping Zheng ◽  
Xuejiao Zhang ◽  
Bai Sun ◽  
Shuangsuo Mao ◽  
Shouhui Zhu ◽  
...  
Keyword(s):  
Resistive Switching ◽  
Sandwich Structure ◽  
Resistance Ratio ◽  
Resistive Switching Memory ◽  
Non Volatile Memory ◽  
Doped Zno ◽  
Volatile Memory ◽  
Memory Applications ◽  
First Time ◽  
Switching Memory

In this paper, the Cu2ZnSnSe4 (CZTSe) film was deposited on the fluorine-doped SnO2 (FTO), and Al-doped ZnO (AZO) and FTO act as top and bottom electrodes for constructing a sandwich structure, in which the AZO/CZTSe/FTO device not only represents outstanding non-volatile resistive switching memory behavior, but also shows a persistently increasing resistance ratio phenomenon for the first time. This work reveals that the device based on CZTSe film holds an excellent memory effect for non-volatile memory applications in the electronic equipment.

scholarly journals Nanogold and nanosilver hybrid polymer materials

2021 ◽  
Author(s):  
◽  
Maria Parry
Keyword(s):  
Silver Nanoparticles ◽  
Metal Nanoparticles ◽  
Hybrid Materials ◽  
Polymer Matrix ◽  
Silver Halide ◽  
Polymer Matrices ◽  
Polymer Materials ◽  
Hybrid Polymer ◽  
Hybrid Polymers ◽  
New Generation

<p>Significant opportunities exist in both the scientific and industrial sectors for the development of new generation hybrid materials. These multifunctional hybrid materials favourably combine the often disparate characteristics of both precursor components in one material. As such, this field can be very innovative due to the many possible combinations of components providing the opportunity to create a wide variety of new generation materials with a range of known and as yet unknown properties. In this manner the research carried out in this PhD research programme combines particular polymer substrates with gold, silver or silver halide nanoparticles, generating multifunctional hybrid materials which exhibit novel and useful optical, antimicrobial and antifouling properties. As such, these hybrid materials are well suited for applications in the healthcare and biomedical devices, food and packaging, surface coatings and the personal hygiene industries. The novel approach developed and used for the production of these nanogold, nanosilver and nanosilver halide hybrid polymer materials did not use conventional external reducing or stabilising agents. Instead, for the nanogold and nanosilver hybrid polymer materials, the Au3+ or Ag+ ions were first absorbed into the polymer substrates (polyurethane, nylon 6,6, polyurethane K5000 latex paint base and amine coated polyethylene terephthalate) and then upon heating the nitrogen-containing functional groups in the polymer matrices reduced the metal ions to their respective metal nanoparticles Au0 and Ag0. Simultaneously a chemical interaction between the metal nanoparticles and the polymer matrix was facilitated. Hence the reduction reaction was effected by the coupled to the oxidation reaction of the nitrogen-containing functional groups. The polymer matrix also afforded control over the nanoparticle size. Silica based BULK ISOLUTE® SORBENTS were used to help elucidate this particular chemistry taking place in the formation of the hybrid polymer materials. The synthesis of the nanosilver halide hybrid polymer materials involved the initial absorption of halide ions into the polymer matrix followed by treatment with silver ions to effect precipitation of nanosize silver halide particles within the polymer matrix, wherein the particle size was similarly controlled by the polymer matrix and precipitation conditions. All formed nanoparticles were therefore stabilised by the polymer matrix. The colour of the resultant hybrid polymer materials is due to the surface plasmon resonance effect of gold and silver nanoparticles. The colour is dependent on the particle size and shape of the nanoparticles and on the refractive index of the surrounding medium. Nanogold hybrid polymers are pink/purple in colour whereas nanosilver hybrid polymers reflect yellow/brown colour. Nanosilver halide hybrid polymers absorb light in the UV range of light and are therefore white in colour. However, due to their photosensitive properties, once exposed to light, silver halides undergo a self-photosensitisation process resulting in formation of silver nanodomains (smaller nanoparticles) on the surface of the silver halide nanoparticles. This gives rise to their absorption in the visible range of light making the hybrid polymer materials appear purple/brown in colour. Nanosilver iodide hybrid polymer materials do not show this effect to any extent and remain as their typical yellow colour. The reflected colours of the hybrid polymer materials and therefore the particle sizes and shapes of metal nanoparticles were investigated by the UV-Vis spectroscopy. The electron microscopy (SEM and TEM) studies showed the morphology of the hybrid polymer materials and that the nanoparticles were not only deposited on the surface but distributed within the polymer matrix. The metal nanoparticles varied in sizes and shapes, particle agglomerates were observed. The confirmation of gold, silver or silver halide species was undertaken using energy dispersive spectroscopy (EDS), scanning transmission spectroscopy (STEM) and X-ray diffraction (XRD). Furthermore, X-ray photoelectron spectroscopy (XPS) was carried out in order to study the nature of the interaction between the formed metal nanoparticles and the polymer matrix. It was demonstrated that the gold and silver nanoparticles are bound to the polymer matrices via Au-N and Ag-N bonds respectively, through the nitrogen-containing functional groups of the polymer matrices. The presence of the oxidised nitrogen species (NOx) confirmed that the electrons required for the reduction of Au3+ and Ag+ to the respective nanoparticles were provided by the coupled oxidation reaction of the nitrogen-containing groups in the polymer matrices. The XPS studies showed there is an interaction between the silver on the surface of the AgX nanoparticles and the nitrogen and oxygen groups present in the polymer matrix. The observation that only very small amounts of Au3+ and Ag+ ions could be leached from the nanogold and nanosilver hybrid materials confirmed the integrity of this chemical bonding between the gold or silver nanoparticles and the polymer matrix. The nanogold, nanosilver and nanosilver halide polymer materials showed effective antimicrobial properties. They were successfully tested against gram negative bacteria Escherichia coli. Additionally, the new generation nanogold and nanosilver hybrid polymer materials have been shown to exhibit antifouling properties.</p>

scholarly journals Nanogold and nanosilver hybrid polymer materials

2021 ◽  
Author(s):  
◽  
Maria Parry
Keyword(s):  
Silver Nanoparticles ◽  
Metal Nanoparticles ◽  
Hybrid Materials ◽  
Polymer Matrix ◽  
Silver Halide ◽  
Polymer Matrices ◽  
Polymer Materials ◽  
Hybrid Polymer ◽  
Hybrid Polymers ◽  
New Generation

<p>Significant opportunities exist in both the scientific and industrial sectors for the development of new generation hybrid materials. These multifunctional hybrid materials favourably combine the often disparate characteristics of both precursor components in one material. As such, this field can be very innovative due to the many possible combinations of components providing the opportunity to create a wide variety of new generation materials with a range of known and as yet unknown properties. In this manner the research carried out in this PhD research programme combines particular polymer substrates with gold, silver or silver halide nanoparticles, generating multifunctional hybrid materials which exhibit novel and useful optical, antimicrobial and antifouling properties. As such, these hybrid materials are well suited for applications in the healthcare and biomedical devices, food and packaging, surface coatings and the personal hygiene industries. The novel approach developed and used for the production of these nanogold, nanosilver and nanosilver halide hybrid polymer materials did not use conventional external reducing or stabilising agents. Instead, for the nanogold and nanosilver hybrid polymer materials, the Au3+ or Ag+ ions were first absorbed into the polymer substrates (polyurethane, nylon 6,6, polyurethane K5000 latex paint base and amine coated polyethylene terephthalate) and then upon heating the nitrogen-containing functional groups in the polymer matrices reduced the metal ions to their respective metal nanoparticles Au0 and Ag0. Simultaneously a chemical interaction between the metal nanoparticles and the polymer matrix was facilitated. Hence the reduction reaction was effected by the coupled to the oxidation reaction of the nitrogen-containing functional groups. The polymer matrix also afforded control over the nanoparticle size. Silica based BULK ISOLUTE® SORBENTS were used to help elucidate this particular chemistry taking place in the formation of the hybrid polymer materials. The synthesis of the nanosilver halide hybrid polymer materials involved the initial absorption of halide ions into the polymer matrix followed by treatment with silver ions to effect precipitation of nanosize silver halide particles within the polymer matrix, wherein the particle size was similarly controlled by the polymer matrix and precipitation conditions. All formed nanoparticles were therefore stabilised by the polymer matrix. The colour of the resultant hybrid polymer materials is due to the surface plasmon resonance effect of gold and silver nanoparticles. The colour is dependent on the particle size and shape of the nanoparticles and on the refractive index of the surrounding medium. Nanogold hybrid polymers are pink/purple in colour whereas nanosilver hybrid polymers reflect yellow/brown colour. Nanosilver halide hybrid polymers absorb light in the UV range of light and are therefore white in colour. However, due to their photosensitive properties, once exposed to light, silver halides undergo a self-photosensitisation process resulting in formation of silver nanodomains (smaller nanoparticles) on the surface of the silver halide nanoparticles. This gives rise to their absorption in the visible range of light making the hybrid polymer materials appear purple/brown in colour. Nanosilver iodide hybrid polymer materials do not show this effect to any extent and remain as their typical yellow colour. The reflected colours of the hybrid polymer materials and therefore the particle sizes and shapes of metal nanoparticles were investigated by the UV-Vis spectroscopy. The electron microscopy (SEM and TEM) studies showed the morphology of the hybrid polymer materials and that the nanoparticles were not only deposited on the surface but distributed within the polymer matrix. The metal nanoparticles varied in sizes and shapes, particle agglomerates were observed. The confirmation of gold, silver or silver halide species was undertaken using energy dispersive spectroscopy (EDS), scanning transmission spectroscopy (STEM) and X-ray diffraction (XRD). Furthermore, X-ray photoelectron spectroscopy (XPS) was carried out in order to study the nature of the interaction between the formed metal nanoparticles and the polymer matrix. It was demonstrated that the gold and silver nanoparticles are bound to the polymer matrices via Au-N and Ag-N bonds respectively, through the nitrogen-containing functional groups of the polymer matrices. The presence of the oxidised nitrogen species (NOx) confirmed that the electrons required for the reduction of Au3+ and Ag+ to the respective nanoparticles were provided by the coupled oxidation reaction of the nitrogen-containing groups in the polymer matrices. The XPS studies showed there is an interaction between the silver on the surface of the AgX nanoparticles and the nitrogen and oxygen groups present in the polymer matrix. The observation that only very small amounts of Au3+ and Ag+ ions could be leached from the nanogold and nanosilver hybrid materials confirmed the integrity of this chemical bonding between the gold or silver nanoparticles and the polymer matrix. The nanogold, nanosilver and nanosilver halide polymer materials showed effective antimicrobial properties. They were successfully tested against gram negative bacteria Escherichia coli. Additionally, the new generation nanogold and nanosilver hybrid polymer materials have been shown to exhibit antifouling properties.</p>

Antibacterial Activity of Biodegradable Particles based on Chitosan Containing Colloidal Silver

2020 ◽  
Vol 36 (4) ◽  
pp. 87-93
Author(s):  
V.Yu. Reshetova ◽  
A.F. Krivoshchepov ◽  
I.A. Butorova ◽  
N.B. Feldman ◽  
S.V. Lutsenko ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Polymer Matrix ◽  
Adipic Acid ◽  
Antibacterial Effect ◽  
Academic Excellence ◽  
Colloidal Silver ◽  
Scanning Electron Microscopy Data ◽  
Covalent Bonds ◽  
Agar Diffusion Test

Chitosan beads with colloidal silver nanoparticles inclued in the polymer matrix have been obtained by the introduction of chitosan into an acidified nanosilver sol. Dual interconnection of drops of the resulting solution was then carried out by ionotropic gelation at the first stage and covalent crosslinking of the polymer matrix with adipic acid at the second stage. The surface morphology of the obtained beads was studied by scanning electron microscopy. Data of Fourier transform IR spectroscopy confirmed the formation of covalent bonds between chitosan and adipic acid. The antibacterial activity of obtained beads against S. aureus and E. coli was evaluated using agar diffusion test. It was shown that the сhitosan beads modified with nanostructured silver exhibited an antibacterial effect against the tested strains, and they can be used as a basis for creating biodegradable wound healing dressings with a prolonged antibacterial effect. chitosan, silver nanoparticles, antibacterial activity, wound dressings This work was supported by the "Russian Academic Excellence Project 5-100". The study was carried out with the financial support of the Russian Foundation for Basic Research in the framework of the Scientific Project no. 18-29-18039.

Charge Transport and Resistive Switching in a 2D hybrid interface

2020 ◽  
pp. 111195
Author(s):  
Karuna Kumari ◽  
Ashutosh Kumar ◽  
Ajay D Thakur ◽  
S.J. Ray
Keyword(s):  
Charge Transport ◽  
Resistive Switching ◽  
Hybrid Interface

Nanobiotechnology: Nature-inspired silver nanoparticles towards green synthesis

2021 ◽  
pp. 0958305X2198988
Author(s):  
Nur Syakirah Rabiha Rosman ◽  
Noor Aniza Harun ◽  
Izwandy Idris ◽  
Wan Iryani Wan Ismail
Keyword(s):  
Electrical Conductivity ◽  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Metal Nanoparticles ◽  
Current Trend ◽  
Biological Properties ◽  
Noble Metal Nanoparticles ◽  
Current Application ◽  
Physical Chemical ◽  
Physical And Chemical

The emergence of technology to produce nanoparticles (1 nm – 100 nm in size) has drawn significant researchers’ interests. Nanoparticles can boost the antimicrobial, catalytic, optical, and electrical conductivity properties, which cannot be achieved by their corresponding bulk. Among other noble metal nanoparticles, silver nanoparticles (AgNPs) have attained a special emphasis in the industry due to their superior physical, chemical, and biological properties, closely linked to their shapes, sizes, and morphologies. Proper knowledge of these NPs is essential to maximise the potential of biosynthesised AgNPs in various applications while mitigating risks to humans and the environment. This paper aims to critically review the global consumption of AgNPs and compare the AgNPs synthesis between conventional methods (physical and chemical) and current trend method (biological). Related work, advantages, and drawbacks are also highlighted. Pertinently, this review extensively discusses the current application of AgNPs in various fields. Lastly, the challenges and prospects of biosynthesised AgNPs, including application safety, oxidation, and stability, commercialisation, and sustainability of resources towards a green environment, were discussed.

Resistive switching characteristics of all-solution-based Ag/TiO2/Mo-doped In2O3devices for non-volatile memory applications

2016 ◽  
Vol 4 (46) ◽  
pp. 10967-10972 ◽  
Author(s):  
Sujaya Kumar Vishwanath ◽  
Jihoon Kim
Keyword(s):  
Resistive Switching ◽  
Retention Time ◽  
Elevated Temperatures ◽  
Switching Behavior ◽  
Memory Devices ◽  
Bipolar Switching ◽  
Non Volatile Memory ◽  
Volatile Memory ◽  
Switching Characteristics ◽  
Memory Applications

The all-solution-based memory devices demonstrated excellent bipolar switching behavior with a high resistive switching ratio of 103, excellent endurance of more than 1000 cycles, stable retention time greater than 104s at elevated temperatures, and fast programming speed of 250 ns.

One-step preparation of antimicrobial silver nanoparticles in polymer matrix

2015 ◽  
Vol 17 (3) ◽  
Author(s):  
O. Lyutakov ◽  
Y. Kalachyova ◽  
A. Solovyev ◽  
S. Vytykacova ◽  
J. Svanda ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Polymer Matrix ◽  
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