One-Step Rapid Synthesis of Al-Based Ag Dendrites for Highly Active and Cost Effective SERS Plasmonic Substrates

2020 ◽  
Vol 861 ◽  
pp. 309-314
Author(s):  
Jian Huang ◽  
Zhe Lei ◽  
Qian Zhang ◽  
Mei Juan Su ◽  
Liang Liu
Keyword(s):  
Organic Contaminants ◽  
Dendritic Structure ◽  
Cost Effective ◽  
Synthesis Process ◽  
Label Free ◽  
Organic Additives ◽  
Sers Substrates ◽  
Highly Active ◽  
Relative Standard ◽  
One Step

Highly active Al-based Ag dendrites SERS plasmonic substrates have been rapidly synthesized by the one-step galvanic displacement reaction without the use of any surfactants and templates. The as-prepared SERS substrates were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Raman spectroscopy. XRD measurements confirmed the metallic nature of the formed Ag dendrites. None of the organic additives were used in the synthesis process, which ensures the substrates surfaces are completely clean and avoiding the introduction of organic contaminants. The innovative rough bionic substrates yield a final silver dendritic structure that offers large specific surface area and high-density hotspots. Using malachite green as a model target, the Al-based Ag dendrites SERS substrates exhibited acceptable reproducibility (relative standard deviation of 23.8%) and high enhancement capacities (pushed the detection limit down to 10 pM). Importantly, these Ag dendrites could potentially be employed as highly active and cost effective flexible SERS sensors for label-free ultrasensitive detection of biomolecules.

Fabrication of large-scale gold nanoplate films as highly active SERS substrates for label-free DNA detection

2013 ◽  
Vol 43 ◽  
pp. 193-199 ◽  
Author(s):  
Liyan Bi ◽  
Yanying Rao ◽  
Qin Tao ◽  
Jian Dong ◽  
Ting Su ◽  
...  
Keyword(s):  
Large Scale ◽  
Dna Detection ◽  
Label Free ◽  
Sers Substrates ◽  
Highly Active ◽  
Free Dna

One-step large-scale highly active g-C3N4 nanosheets for efficient sunlight-driven photocatalytic hydrogen production

2017 ◽  
Vol 46 (32) ◽  
pp. 10678-10684 ◽  
Author(s):  
Waheed Iqbal ◽  
Bocheng Qiu ◽  
Juying Lei ◽  
Lingzhi Wang ◽  
Jinlong Zhang ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Large Scale ◽  
Environmentally Friendly ◽  
Cost Effective ◽  
Photocatalytic Hydrogen Production ◽  
Highly Active ◽  
One Step ◽  
Hydrogen Utilization

The development of highly active, cost-effective, environmentally friendly and stable g-C3N4 based photocatalysts for H2 evolution is one of the most anticipated potential pathways for future hydrogen utilization.

scholarly journals Electrochemical Sensor for Methamphetamine Detection Using Laser-Induced Porous Graphene Electrode

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 73
Author(s):  
Kasrin Saisahas ◽  
Asamee Soleh ◽  
Sunita Somsiri ◽  
Patthamaporn Senglan ◽  
Kiattisak Promsuwan ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Biological Fluids ◽  
Cost Effective ◽  
Good Precision ◽  
Step Method ◽  
Pattern Design ◽  
Porous Graphene ◽  
Stencil Mask ◽  
Relative Standard ◽  
One Step

A 3D porous graphene structure was directly induced by CO2 laser from the surface of Kapton tape (carbon source) supported by polyethylene terephthalate (PET) laminating film. A highly flexible laser-induced porous graphene (LI-PGr) electrode was then fabricated via a facile one-step method without reagent and solvent in a procedure that required no stencil mask. The method makes pattern design easy, and production cost-effective and scalable. We investigated the performance of the LI-PGr electrode for the detection of methamphetamine (MA) on household surfaces and in biological fluids. The material properties and morphology of LI-PGr were analysed by scanning electron microscopy (SEM), energy dispersive x-ray (EDX) and Raman spectroscopy. The LI-PGr electrode was used as the detector in a portable electrochemical sensor, which exhibited a linear range from 1.00 to 30.0 µg mL−1 and a detection limit of 0.31 µg mL−1. Reproducibility was good (relative standard deviation of 2.50% at 10.0 µg mL−1; n = 10) and anti-interference was excellent. The sensor showed good precision and successfully determined MA on household surfaces and in saliva samples.

One-Step Synthesis of Co3O4 Thin Film by Reactive Spray Deposition Technology for Efficient Electrochemical Water Splitting

MRS Advances ◽  
2018 ◽  
Vol 3 (4) ◽  
pp. 185-189
Author(s):  
Yang Wang ◽  
Junkai He ◽  
Radenka Maric
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Spray Deposition ◽  
Synthesis Method ◽  
Redox Activity ◽  
Synthesis Process ◽  
Metal Catalyst ◽  
Highly Active ◽  
One Step ◽  
Deposition Technology

ABSTRACTEfficient catalysts for the oxygen evolution reaction (OER) are widely applied in fuel cells and rechargeable lithium air batteries. It is desirable but challenging to achieve comparable activity to that of the noble-metal catalyst with non-precious metal catalyst. Highly active Co3O4 thin film electrodes have been successfully synthesized by a rapid one-step flame combustion synthesis method called Reactive Spray Deposition Technology. X-ray diffraction confirms the absence of any impurity phase with this synthesis process. The detailed morphology of the Co3O4 thin film is investigated with scanning electron microscopy and transmission electron microscopy. Cyclic voltammetry is used to investigate the redox activity of Co3+ to Co4+ which is crucial for the OER performance. The as-prepared Co3O4 catalyst demonstrates promising activity for OER, with an overpotential of 399 mV (at 10 mA cm-2) for OER.

scholarly journals Development and Application of Aptamer-Based Surface-Enhanced Raman Spectroscopy Sensors in Quantitative Analysis and Biotherapy

Sensors ◽  
2019 ◽  
Vol 19 (17) ◽  
pp. 3806 ◽  
Author(s):  
Hai-Xia Wang ◽  
Yu-Wen Zhao ◽  
Zheng Li ◽  
Bo-Shi Liu ◽  
Di Zhang
Keyword(s):  
Surface Enhanced Raman Spectroscopy ◽  
Raman Signal ◽  
Label Free ◽  
Sers Substrates ◽  
Highly Active ◽  
Detection Technology ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Target Molecules

Surface-enhanced Raman scattering (SERS) is one of the most special and important Raman techniques. An apparent Raman signal can be observed when the target molecules are absorbed onto the surface of the SERS substrates, especially on the “hot spots” of the substrates. Early research focused on exploring the highly active SERS substrates and their detection applications in label-free SERS technology. However, it is a great challenge to use these label-free SERS sensors for detecting hydrophobic or non-polar molecules, especially in complex systems or at low concentrations. Therefore, antibodies, aptamers, and antimicrobial peptides have been used to effectively improve the target selectivity and meet the analysis requirements. Among these selective elements, aptamers are easy to use for synthesis and modifications, and their stability, affinity and specificity are extremely good; they have been successfully used in a variety of testing areas. The combination of SERS detection technology and aptamer recognition ability not only improved the selection accuracy of target molecules, but also improved the sensitivity of the analysis. Variations of aptamer-based SERS sensors have been developed and have achieved satisfactory results in the analysis of small molecules, pathogenic microorganism, mycotoxins, tumor marker and other functional molecules, as well as in successful photothermal therapy of tumors. Herein, we present the latest advances of the aptamer-based SERS sensors, as well as the assembling sensing platforms and the strategies for signal amplification. Furthermore, the existing problems and potential trends of the aptamer-based SERS sensors are discussed.

scholarly journals Trimethyl Chitosan/Siloxane-Hybrid Coated Fe3O4 Nanoparticles for the Uptake of Sulfamethoxazole from Water

Molecules ◽  
2019 ◽  
Vol 24 (10) ◽  
pp. 1958 ◽  
Author(s):  
Sofia F. Soares ◽  
Tiago Fernandes ◽  
Tito Trindade ◽  
Ana L. Daniel-da-Silva
Keyword(s):  
Organic Contaminants ◽  
Cost Effective ◽  
Surface Coatings ◽  
Dominant Effect ◽  
Coated Particles ◽  
Trimethyl Chitosan ◽  
Magnetite Fe3o4 ◽  
One Step ◽  
Coating Procedure ◽  
Shell Particles

The presence of several organic contaminants in the environment and aquatic compartments has been a matter of great concern in the recent years. To tackle this problem, new sustainable and cost-effective technologies are needed. Herein we describe magnetic biosorbents prepared from trimethyl chitosan (TMC), which is a quaternary chitosan scarcely studied for environmental applications. Core@shell particles comprising a core of magnetite (Fe3O4) coated with TMC/siloxane hybrid shells (Fe3O4@SiO2/SiTMC) were successfully prepared using a simple one-step coating procedure. Adsorption tests were conducted to investigate the potential of the coated particles for the magnetically assisted removal of the antibiotic sulfamethoxazole (SMX) from aqueous solutions. It was found that TMC-based particles provide higher SMX adsorption capacity than the counterparts prepared using pristine chitosan. Therefore, the type of chemical modification introduced in the chitosan type precursors used in the surface coatings has a dominant effect on the sorption efficiency of the respective final magnetic nanosorbents.

Electron Donation by Low-Crystalline Ba-La-Ce Oxygen-Deficient Composite Oxide Accumulating on Ru Nanoparticles for Ammonia Synthesis under Mild Conditions

2019 ◽  
Author(s):  
Katsutoshi Sato ◽  
Shin-ichiro Miyahara ◽  
Yuta Ogura ◽  
Kotoko Tsujimaru ◽  
Yuichiro Wada ◽  
...  
Keyword(s):  
Ammonia Synthesis ◽  
Bond Cleavage ◽  
Synthesis Process ◽  
Strong Electron ◽  
Mild Conditions ◽  
Ru Nanoparticles ◽  
Rate Determining Step ◽  
Highly Active ◽  
Composite Oxides ◽  
Low Crystalline

<p>To mitigate global problems related to energy and global warming, it is helpful to develop an ammonia synthesis process using catalysts that are highly active under mild conditions. Here we show that the ammonia synthesis activity of Ru/Ba/LaCeO<i><sub>x</sub></i> pre-reduced at 700 °C is the highest reported among oxide-supported Ru catalysts. Our results indicate that low crystalline oxygen-deficient composite oxides, which include Ba<sup>2+</sup>, Ce<sup>3+</sup> and La<sup>3+</sup>, with strong electron-donating ability, accumulate on Ru particles and thus promote N≡N bond cleavage, which is the rate determining step for ammonia synthesis.</p>

Electron Donation by Low-Crystalline Ba-La-Ce Oxygen-Deficient Composite Oxide Accumulating on Ru Nanoparticles for Ammonia Synthesis under Mild Conditions

2019 ◽  
Author(s):  
Katsutoshi Sato ◽  
Shin-ichiro Miyahara ◽  
Yuta Ogura ◽  
Kotoko Tsujimaru ◽  
Yuichiro Wada ◽  
...  
Keyword(s):  
Ammonia Synthesis ◽  
Bond Cleavage ◽  
Synthesis Process ◽  
Strong Electron ◽  
Mild Conditions ◽  
Ru Nanoparticles ◽  
Rate Determining Step ◽  
Highly Active ◽  
Composite Oxides ◽  
Low Crystalline

<p>To mitigate global problems related to energy and global warming, it is helpful to develop an ammonia synthesis process using catalysts that are highly active under mild conditions. Here we show that the ammonia synthesis activity of Ru/Ba/LaCeO<i><sub>x</sub></i> pre-reduced at 700 °C is the highest reported among oxide-supported Ru catalysts. Our results indicate that low crystalline oxygen-deficient composite oxides, which include Ba<sup>2+</sup>, Ce<sup>3+</sup> and La<sup>3+</sup>, with strong electron-donating ability, accumulate on Ru particles and thus promote N≡N bond cleavage, which is the rate determining step for ammonia synthesis.</p>

Calorimetric Sensor for Ethanol Using Ni2+-nitrilotriacetic Acid (NTA) Resin Immobilized Alcohol Dehydrogenase (ADH)

2020 ◽  
Vol 16 (6) ◽  
pp. 795-799
Author(s):  
YongJin Li
Keyword(s):  
Cost Effective ◽  
Nitrilotriacetic Acid ◽  
Repeated Measurements ◽  
Great Promise ◽  
Calorimetric Sensor ◽  
Controlled Pore Glass ◽  
Pore Glass ◽  
One Step ◽  
Immobilization Matrix ◽  
Enzyme Thermistor

Background: A simple, fast and economic analytical method for the determination of ethanol is important for clinical, biological, forensic and physico-legal purposes. Methods: Ni2+-NTA resin was used as an immobilization matrix for the simple one-step purification/ immobilization of his6-tagged ADH. Different alcohols with a concentration range of 0.5-50% V/V, namely methanol, ethanol and propanol were measured using prepared ADH enzyme thermistor. The ethanol content of Tsingtao beer was tested as a real sample containing alcohol. Reproducibility and stability of prepared ADH enzyme thermistor were also investigated by repeated measurements. Results: In comparison to the controlled pore glass (a common used support for the immobilization of enzyme) used in thermal biosensor, the use of Ni2+-NTA resin not only led to simple one-step purification/ immobilization by his6-tagged ADH binding to Ni2+-NTA resin, but also made the immobilizing supports reusable. The prepared biosensor can be used to determine ethanol and methanol by the calorimetric measurement. A linear range of 1 -32% (V/V) and 2-20% (V/V) was observed for ethanol and methanol, respectively. The detection limits were 0.3% (V/V) and 1% (V/V) for ethanol and methanol, respectively. The tested ethanol concentration of Tsingtao beer was 4.5% V/V, which is comparable with the labeled alcohol by volume (ABV) 4.80%. Conclusion: Ni2+-NTA resin, as an immobilization matrix in ET sensor, provides a simple one-step purification/immobilization for His6-tagged recombinase and a reusable immobilization matrix. The prepared biosensor exhibits good repeatability and stability. Such a new biosensor shows great promise for rapid, simple, and cost-effective analysis of ethanol and methanol, both in qualitative and in quantitative tests.

Chemical reduction of chlorpyrifos driven by flavin mononucleotide functionalized titanium (IV) dioxide

2020 ◽  
Vol 5 (11) ◽  
Author(s):  
Stephanie Santos Díaz ◽  
Hazim Al-Zubaidi ◽  
Amir C. Ross-Obare ◽  
Sherine O. Obare
Keyword(s):  
Functional Groups ◽  
Organic Contaminants ◽  
Chemical Reduction ◽  
Flavin Mononucleotide ◽  
Reaction Conditions ◽  
Organophosphate Compounds ◽  
Biological Molecule ◽  
Highly Active ◽  
New Directions ◽  
Detrimental Impact

AbstractFor many decades, organohalide and organophosphate compounds have shown significant detrimental impact on the environment. Consequently, strategies for their remediation continue to be an area of emerging need. The reduction of the chlorpyrifos pesticide, a molecule that bears both organohalide and organophosphate functional groups, is an important area of investigation due to it toxic nature. In this report, we demonstrate the effectiveness of the biological molecule, flavin mononucleotide (FMN) toward chemically reducing chlorpyrifos. The FMN was found to be highly active when anchored to nanocrystalline TiO2 surfaces. The results show new directions toward the remediation of organic contaminants under mild reaction conditions.

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