scholarly journals Meso-tetra (4-sulfonatophenyl) porphyrin silver / Ag nanoparticles / graphene phase C3N4 with a sandwich-like structure and double-faced active centers via two-step room-temperature photocatalytic synthesis for ractopamine detection

2021 ◽  
Author(s):  
Xuehua Weng ◽  
Hui-Ling Ye ◽  
Wenqiang Xie ◽  
Meihui Ying ◽  
Haibo Pan ◽  
...  
Keyword(s):  
Green Chemistry ◽  
Electrochemical Detection ◽  
Ag Nanoparticles ◽  
Room Temperature ◽  
Photochemical Synthesis ◽  
Active Centers ◽  
Novel Approach ◽  
Visible Irradiation ◽  
Photocatalytic Synthesis

Photochemical synthesis under visible irradiation is a novel approach in the field of green chemistry, and composites with abundant active centers for electrochemical detection are greatly attractive. Herein, meso-tetra (4-sulfonatophenyl)...

scholarly journals Ag Nanoparticles Sensitized In2O3 Nanograin for the Ultrasensitive HCHO Detection at Room Temperature

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Shiqiang Zhou ◽  
Mingpeng Chen ◽  
Qingjie Lu ◽  
Yumin Zhang ◽  
Jin Zhang ◽  
...  
Keyword(s):  
Indoor Air ◽  
Ag Nanoparticles ◽  
Room Temperature ◽  
Unsolved Problem ◽  
Air Pollutant ◽  
Ag Nps ◽  
Performance Targets ◽  
Fabrication Cost ◽  
Low Concentrations ◽  
Stringent Performance

AbstractFormaldehyde (HCHO) is the main source of indoor air pollutant. HCHO sensors are therefore of paramount importance for timely detection in daily life. However, existing sensors do not meet the stringent performance targets, while deactivation due to sensing detection at room temperature, for example, at extremely low concentration of formaldehyde (especially lower than 0.08 ppm), is a widely unsolved problem. Herein, we present the Ag nanoparticles (Ag NPs) sensitized dispersed In2O3 nanograin via a low-fabrication-cost hydrothermal strategy, where the Ag NPs reduces the apparent activation energy for HCHO transporting into and out of the In2O3 nanoparticles, while low concentrations detection at low working temperature is realized. The pristine In2O3 exhibits a sluggish response (Ra/Rg = 4.14 to 10 ppm) with incomplete recovery to HCHO gas. After Ag functionalization, the 5%Ag-In2O3 sensor shows a dramatically enhanced response (135) with a short response time (102 s) and recovery time (157 s) to 1 ppm HCHO gas at 30 °C, which benefits from the Ag NPs that electronically and chemically sensitize the crystal In2O3 nanograin, greatly enhancing the selectivity and sensitivity.

scholarly journals Catalysis in the Service of Green Chemistry: Nobel Prize-Winning Palladium-Catalysed Cross-Couplings, Run in Water at Room Temperature

2012 ◽  
Vol 56 (2) ◽  
pp. 62-74 ◽  
Author(s):  
Bruce H. Lipshutz ◽  
Benjamin R. Taft ◽  
Alexander R. Abela ◽  
Subir Ghorai ◽  
Arkady Krasovskiy ◽  
...  
Keyword(s):  
Green Chemistry ◽  
Nobel Prize ◽  
Room Temperature

Sintering of Silver Nanoparticles at Room-Temperature for Conductive Ink Applications

2018 ◽  
Vol 775 ◽  
pp. 144-148 ◽  
Author(s):  
Bethel Faith Y. Rezaga ◽  
Mary Donnabelle L. Balela
Keyword(s):  
Particle Size ◽  
Ag Nanoparticles ◽  
Room Temperature ◽  
Average Diameter ◽  
Aqueous System ◽  
Ag Nanoparticle ◽  
Nacl Solution ◽  
Cellulose Acetate Film ◽  
Sintered Ag ◽  
Nanoparticle Ink

Silver (Ag) nanoparticles synthesized in an aqueous system was sintered at room temperature using NaCl solution. The Ag nanoparticles have an average diameter of about 24 nm. After dispersing the Ag nanoparticles in 50mM NaCl solution, a significant increase in particle size to about 206 nm was observed. On the other hand, the particle size was also increased to about 175 nm when the Ag nanoparticles were printed and then 50mM NaCl solution was dropped onto the printed Ag nanoparticles. The enlargement of particle size was accompanied by the increase in conductivity of the Ag nanoparticle ink. The resistance was reduced from 57.7 to 6.5 and 6.7 ohms for the as-prepared and sintered Ag nanoparticles using two different treatments, respectively. The sintered Ag nanoparticle ink formulation exhibit high conductivity when drawn on both cellulose acetate film and bond paper even after bending and folding of the substrates.

Fusing of Silver Nanoparticles at Room Temperature Using Halide Solutions for Conductive Inks

2020 ◽  
Vol 833 ◽  
pp. 181-185 ◽  
Author(s):  
Bethel Faith Y. Rezaga ◽  
Mary Donnabelle L. Balela
Keyword(s):  
Particle Size ◽  
Ag Nanoparticles ◽  
Room Temperature ◽  
Average Diameter ◽  
Aqueous System ◽  
Ag Nanoparticle ◽  
Nacl Solution ◽  
Halide Solution ◽  
Sintered Ag ◽  
Nanoparticle Ink

Fusing of silver (Ag) nanoparticles synthesized in an aqueous system was observed at room temperature using halide solutions. The as-synthesized Ag nanoparticles have an average diameter of about 24 nm. After dispersing the Ag nanoparticles in a halide solution, a significant increase in particle size to about 188-197 nm was observed. The enlargement of particle size was accompanied by the increase in conductivity of the Ag nanoparticle ink. The resistance was reduced from 110 kiloohms to 35 and 9.3 ohms for the as-prepared and sintered Ag nanoparticles using NaBr and NaCl solution, respectively.

Electrochemical Sensor for Determination of Pb2+ Based on Gold Nanoparticles

2020 ◽  
Vol 20 (6) ◽  
pp. 3356-3360
Author(s):  
Hao Yong Yin ◽  
Yi Fan Zheng ◽  
Ling Wang
Keyword(s):  
Gold Nanoparticles ◽  
Electrochemical Sensor ◽  
Electrochemical Detection ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Room Temperature ◽  
Low Cost ◽  
Differential Pulse ◽  
Practical Application

We report the formation of gold nanoparticles on indium tin oxide conducting glass (ITO) surface via electrodeposition method at room temperature. The prepared nano-Au electrodes has been fabricated for sensitive detection of Pb2+, and showed highly selective response toward Pb2+. The electrochemical detection of Pb2+ were determined by differential pulse stripping voltammetric (DPSV). The nano-Au electrochemical sensor could detect Pb2+ from 0.5 to 10 μM with detection limits of 0.06 μM (S/N= 3) and sensitivity of 0.27996 mA μM−1. The proposed sensor is simple, reliable, sensitive, selective, and low-cost, thus holds potential for practical application in Pb2+ detection.

scholarly journals Original photochemical synthesis of Ag nanoparticles mediated by potato starch

2019 ◽  
Vol 1 (6) ◽  
Author(s):  
Michele Avila dos Santos ◽  
Leonardo Giordano Paterno ◽  
Sanclayton Geraldo Carneiro Moreira ◽  
Maria José Araújo Sales
Keyword(s):  
Ag Nanoparticles ◽  
Potato Starch ◽  
Photochemical Synthesis

Green Three-component Synthesis of Merocyanin Dyes Based on 4- Arylideneisoxazol-5(4H)-ones

2020 ◽  
Vol 7 (2) ◽  
pp. 217-225
Author(s):  
Fatemeh K. Damghani ◽  
Hamzeh Kiyani ◽  
Seied A. Pourmousavi
Keyword(s):  
Green Chemistry ◽  
Aqueous Medium ◽  
Room Temperature ◽  
Choline Chloride ◽  
Energy Sources ◽  
One Pot ◽  
Ultrasound Waves ◽  
Simple Preparation ◽  
Three Component Reaction ◽  
Component Approach

A one-pot three-component reaction promoted by choline chloride: zinc(II) chloride deepeutectic solvent (ChCl-ZnCl2 DES) in an aqueous medium for the synthesis of several merocyanin dyes based on isoxazol-5(4H)-ones is presented. This three-component approach is efficient, clean, experimentally simple, convenient, safe, and environmentally friendly. This reaction was performed at room temperature without using energy sources such as heat, microwave and ultrasound waves. Nonuse of toxic solvents, available materials, one-vessel, no wasted reagents, simple preparation, and recyclability of DES are other important points of this method that is significant from the perspective of green chemistry.

Ag nanoparticles anchored onto porous CuO nanobelts for the ultrasensitive electrochemical detection of dopamine in human serum

2021 ◽  
Vol 327 ◽  
pp. 128878 ◽  
Author(s):  
Yong-Yu Li ◽  
Ping Kang ◽  
Shi-Qi Wang ◽  
Zhang-Gang Liu ◽  
Yi-Xiang Li ◽  
...  
Keyword(s):  
Human Serum ◽  
Electrochemical Detection ◽  
Ag Nanoparticles

Bonding of Cu wires by solid state sintering of Ag nanoparticles at low temperatures

2009 ◽  
Vol 1207 ◽  
Author(s):  
Hani Alarifi ◽  
Anming Hu ◽  
Mustafa Yavuz ◽  
Y. Zhou
Keyword(s):  
Solid State ◽  
Ag Nanoparticles ◽  
Joint Strength ◽  
Room Temperature ◽  
Bonding Temperature ◽  
Tensile Shear ◽  
Shear Tests ◽  
Organic Shell ◽  
Solid State Sintering ◽  
Metallic Bond

AbstractSolid state sintering of Ag nanoparticles was used to bond Cu wires to Cu foils at temperatures less than 250°C. The Ag nanoparticles are coated with an organic shell to prevent sintering at room temperature. After annealing the nanoparticles at 200°C, the decomposition of the organic shell was confirmed using TGA and Raman spectroscopy. The joint strength was measured by tensile shear tests, which shows that the joint strength increases as the bonding temperature increases. Metallic bond between Ag nanoparticles and Cu was achieved with no contamination. Bonds formed by our method, was confirmed to withstand temperatures higher than the bonding temperatures.

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