scholarly journals Rapidly fabricating large-scale plasmonic silver nanosphere arrays with sub-20 nm gap on Si-pyramids by inverted annealing for highly sensitive SERS detection

RSC Advances ◽  
2017 ◽  
Vol 7 (19) ◽  
pp. 11578-11584 ◽  
Author(s):  
Yujin Wang ◽  
Yang Yang ◽  
Yu Sun ◽  
Baogang Quan ◽  
Yunlong Li ◽  
...  
Keyword(s):  
Large Scale ◽  
Highly Sensitive ◽  
Sers Detection ◽  
20 Nm ◽  
Annealing Method

An inverted annealing method is developed to fabricate rapidly plasmonic silver nanosphere arrays with sub-20 nm gaps for highly sensitive SERS detection.

scholarly journals The utility of self-rated health in population surveys: the role of bodyweight

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Robert Bozick
Keyword(s):  
Treatment Group ◽  
Large Scale ◽  
Well Being ◽  
Control Group ◽  
Self Rated Health ◽  
Risk Of Mortality ◽  
Highly Sensitive ◽  
The Usa ◽  
Group Members ◽  
Nationally Representative

Abstract Background Self-rated health (SRH) is one of the most commonly used summary measures of overall health and well-being available to population scientists due to its ease of administration in large-scale surveys and to its efficacy in predicting mortality. This paper assesses the extent to which SRH is affected by its placement before or after questions about bodyweight on a survey, and whether differences in placement on the questionnaire affects SRH’s predictive validity. Methods I assessed the validity of SRH in predicting the risk of mortality by comparing outcomes of sample members who were asked to rate their health before reporting on their bodyweight (the control group) and sample members who were asked to rate their health after reporting on their bodyweight (the treatment group). Both the control and treatment group were randomly assigned via an experiment administered as a module in a nationally representative sample of adults in the USA in 2019 (N = 2523). Results The odds of reporting a more favorable appraisal of health are 30% lower for sample members who were in the treatment group when compared with the control group. Additionally, the SRH of treatment group members is significantly associated with their risk of mortality, while the SRH of control group members is not. Conclusion The findings from this study suggest that for researchers to maximize the utility of SRH, closer attention needs to be paid to the context of the survey within which it asked. SRH is highly sensitive to the questions that precede it, and this sensitivity may in turn mischaracterize the true health of the population that the survey is intending to measure.

Plasmonic MoO3−x@MoO3 nanosheets for highly sensitive SERS detection through nanoshell-isolated electromagnetic enhancement

2016 ◽  
Vol 52 (14) ◽  
pp. 2893-2896 ◽  
Author(s):  
Xianjun Tan ◽  
Lingzhi Wang ◽  
Chen Cheng ◽  
Xuefeng Yan ◽  
Bin Shen ◽  
...  
Keyword(s):  
Electromagnetic Enhancement ◽  
Highly Sensitive ◽  
Sers Detection

Nanoshell-isolated electromagnetic enhancing for highly sensitive sers detection.

Highly sensitive SERS detection of cancer proteins in low sample volume using hollow core photonic crystal fiber

2012 ◽  
Vol 33 (1) ◽  
pp. 293-298 ◽  
Author(s):  
Dinish U. S. ◽  
Chit Yaw Fu ◽  
Kiat Seng Soh ◽  
Bhuvaneswari Ramaswamy ◽  
Anil Kumar ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Sample Volume ◽  
Hollow Core ◽  
Crystal Fiber ◽  
Highly Sensitive ◽  
Sers Detection

scholarly journals Ag Nanoparticle-Decorated Cu2S Nanosheets for Surface Enhanced Raman Spectroscopy Detection and Photocatalytic Applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2508
Author(s):  
Osama Nasr ◽  
Jian-Ru Jiang ◽  
Wen-Shuo Chuang ◽  
Sheng-Wei Lee ◽  
Chih-Yen Chen
Keyword(s):  
Reduction Method ◽  
Organic Pollutant ◽  
Surface Enhanced Raman Spectroscopy ◽  
Highly Sensitive ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Enhanced Raman Scattering ◽  
New Generation ◽  
Photocatalytic Applications

In this article, we demonstrate a facile, rapid, and practical approach to growing high-quality Cu2S nanosheets decorated with Ag nanoparticles (NPs) through the galvanic reduction method. The Ag/Cu2S nanosheets were efficiently applied to the surface-enhanced Raman scattering (SERS) and photocatalytic degradation applications. The photodegradation of RhB dye with the Ag/Cu2S nanosheets composites occurred at a rate of 2.9 times faster than that observed with the undecorated Cu2S nanosheets. Furthermore, the Ag/Cu2S nanosheets displayed highly sensitive SERS detection of organic pollutant (R6G) as low as 10−9 M. The reproducibility experiments indicated that the Ag/Cu2S nanosheets composites could be used for dual functionality in a new generation of outstandingly sensitive SERS probes for detection and stable photocatalysts.

scholarly journals Aminophosphine Reduction Mechanisms and the Synthesis of Indium Phosphide Nanomaterials

2021 ◽  
Author(s):  
◽  
Geoffry Laufersky
Keyword(s):  
Indium Phosphide ◽  
Density Functional ◽  
Large Scale ◽  
Visible Spectrum ◽  
Size Dependent ◽  
Reduction Mechanisms ◽  
Highly Sensitive ◽  
Dependent Absorption ◽  
Entire Visible Spectrum ◽  
The Impact

<p>Indium phosphide (InP) nanomaterials are attractive for countless technological applications due to their well-placed band gap energies. The quantum confinement of these semiconductors can give rise to size-dependent absorption and emission features throughout the entire visible spectrum. Therefore, InP materials can be employed as low-toxicity fluorophores that can be implemented in high value avenues such as biological probes, lighting applications, and lasing technologies. However, large scale development of these quantum dots (QDs) has been stymied by the lack of affordable and safe phosphorus precursors. Syntheses have largely been restricted to the use of dangerous chemicals such as tris(trimethylsilyl)phosphine ((TMS)₃P), which is costly and highly sensitive to oxygen and water. Recently, less-hazardous tris(dialkylamino)phosphines have been introduced to produce InP QDs on par with those utilizing (TMS)₃P. However, a poor understanding of the reaction mechanics has resulted in difficulties tuning and optimizing this method.  In this work, density functional theory (DFT) is used to identify the mechanism of this aminophosphine precursor conversion. This understanding is then implemented to design an improved InP QD synthesis, allowing for the production of high-quality materials outside of glovebox conditions. Time is spent understanding the impact of different precursor salts on the reaction mechanisms and discerning their subsequent effects on nanoparticle size and quality. The motivation of this work is to formulate safer and less technical indium phosphide quantum dot syntheses to foster non-specialist and industrial implementation of these materials.</p>

A highly sensitive non-enzymatic hydrogen peroxide and hydrazine electrochemical sensor based on 3D micro-snowflake architectures of α-Fe2O3

RSC Advances ◽  
2016 ◽  
Vol 6 (65) ◽  
pp. 59907-59918 ◽  
Author(s):  
S. Majumder ◽  
B. Saha ◽  
S. Dey ◽  
R. Mondal ◽  
S. Kumar ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Electrochemical Sensor ◽  
Large Scale ◽  
Hydrothermal Reaction ◽  
Highly Sensitive ◽  
Hydrolysis Of

In the present work, well crystalline 3D micro-snowflake structured α-Fe2O3 has been successfully synthesized on a large scale via a simple hydrothermal reaction by hydrolysis of a K3Fe(CN)6 precursor.

scholarly journals Extra Surfactant-Assisted Self-Assembly of Highly Ordered Monolayers of BaTiO3 Nanocubes at the Air—Water Interface

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 739 ◽  
Author(s):  
Hiroki Itasaka ◽  
Ken-Ichi Mimura ◽  
Kazumi Kato
Keyword(s):  
Self Assembly ◽  
Large Scale ◽  
Three Dimensional ◽  
Water Interface ◽  
Compression Pressure ◽  
Air Water Interface ◽  
Out Of Plane ◽  
Key Factor ◽  
Evaporation Induced Self Assembly ◽  
20 Nm

Assembly of nanocrystals into ordered two- or three-dimensional arrays is an essential technology to achieve their application in novel functional devices. Among a variety of assembly techniques, evaporation-induced self-assembly (EISA) is one of the prospective approaches because of its simplicity. Although EISA has shown its potential to form highly ordered nanocrystal arrays, the formation of uniform nanocrystal arrays over large areas remains a challenging subject. Here, we introduce a new EISA method and demonstrate the formation of large-scale highly ordered monolayers of barium titanate (BaTiO3, BT) nanocubes at the air-water interface. In our method, the addition of an extra surfactant to a water surface assists the EISA of BT nanocubes with a size of 15–20 nm into a highly ordered arrangement. We reveal that the compression pressure exerted by the extra surfactant on BT nanocubes during the solvent evaporation is a key factor in the self-assembly in our method. The BT nanocube monolayers transferred to substrates have sizes up to the millimeter scale and a high out-of-plane crystal orientation, containing almost no microcracks and voids.

A superhydrophobic–superoleophilic plasmonic membrane for combined oil/water separation and highly-sensitive SERS detection of low concentrations of analytes in oil/water mixtures

2018 ◽  
Vol 42 (14) ◽  
pp. 11660-11664 ◽  
Author(s):  
Cheng Xu ◽  
Ding Cao ◽  
Wenya Lu ◽  
Jun Sun ◽  
Si Cheng
Keyword(s):  
Trace Detection ◽  
Water Separation ◽  
Low Concentrations ◽  
Highly Sensitive ◽  
Sers Detection ◽  
Oil Water Separation ◽  
Oil Water

Superhydrophobic–superoleophilic PS/AuAg ND mats were proven to exhibit integrated oil/water separation ability and act as SERS-active substrates for the trace detection of low concentrations of analyte molecules in oil/water mixtures.

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