A magneto-fluorescence bacteria assay strategy based on dual colour sulfide fluorescent nanoparticles with high near-IR conversion efficiency

The Analyst ◽  
2020 ◽  
Vol 145 (13) ◽  
pp. 4436-4441
Author(s):  
Yanli Zhu ◽  
Jikai Wang ◽  
Yiyang Sun ◽  
Qingyun Cai
Keyword(s):  
Conversion Efficiency ◽  
Fluorescent Nanoparticles ◽  
Naked Eye ◽  
Near Ir ◽  
Dual Colour

Ultra-bright CaS and SrS fluorescent nanoprobes coupling magnetic ZnFe2O4 nanoparticles applied in bacteria quantitative sensing and naked-eye analysis.

Water-tunable solvatochromic and nanoaggregate fluorescence: dual colour visualisation and quantification of trace water in tetrahydrofuran

2017 ◽  
Vol 19 (2) ◽  
pp. 1209-1216 ◽  
Author(s):  
Masaru Tanioka ◽  
Shinichiro Kamino ◽  
Atsuya Muranaka ◽  
Yoshinao Shirasaki ◽  
Yousuke Ooyama ◽  
...  
Keyword(s):  
Dual Fluorescence ◽  
Naked Eye ◽  
Dual Colour ◽  
Trace Water ◽  
Detection Principle

The spirolactone form of aminobenzopyranoxanthenes (ABPXs) exhibited dual solvatochromic and nanoaggregate fluorescence. This intriguing dual fluorescence presented a new detection principle for naked-eye visualisation and quantification of water in tetrahydrofuran.

scholarly journals Remote and contactless infrared imaging techniques for stratigraphical investigations in paintings on canvas

2021 ◽  
Vol 127 (8) ◽  
Author(s):  
Sofia Ceccarelli ◽  
Massimiliano Guarneri ◽  
Noemi Orazi ◽  
Massimo Francucci ◽  
Massimiliano Ciaffi ◽  
...  
Keyword(s):  
Infrared Imaging ◽  
Imaging Techniques ◽  
Laser Scanner ◽  
Structural Defects ◽  
Naked Eye ◽  
Near Ir

AbstractIn the analysis of complex stratigraphical structures like painted artefact, infrared (IR) techniques can provide precious information about elements hidden under superficial layers of the artwork, such as pictorial features and structural defects. This paper presents a novel complementary use of reflectographic and thermographic techniques for the survey of three baroque paintings, preserved at the Chigi Palace in Ariccia (Italy). First, the IR-ITR laser scanner prototype has been used for the preliminary and remote near-IR reflectographic survey of the areas where the canvas was located. The resulting map was then used for planning the thermographic and mid-IR reflectographic studies, focusing the analyses on the most interesting areas of one of the paintings, called “La Primavera”. The combination of the three imaging techniques revealed several details not visible by the naked eye, such as restored lacunas and pentimenti, demonstrating the validity and complementarity of the proposed combined methodologies.

Changes of phthalocyanine visible color caused by near-IR solvatochromism

2018 ◽  
Vol 22 (01n03) ◽  
pp. 88-94 ◽  
Author(s):  
Taniyuki Furuyama ◽  
Shiori Uchiyama ◽  
Takayuki Iwamoto ◽  
Hajime Maeda ◽  
Masahito Segi
Keyword(s):  
Color Change ◽  
Solvent Mixture ◽  
Red Shift ◽  
Ir Absorption ◽  
Color Changes ◽  
Naked Eye ◽  
Near Ir ◽  
New Strategy ◽  
Dependent Position ◽  
External Stimuli

Herein, we show that the Zn complex of 1,4,8,11,15,18,22,28-octakis(butoxy)phthalocyanine exhibits solvatochromism and characterize the corresponding visible color changes. In particular, we reveal that although the variation of the solvent-dependent position of the Q band is relatively small (~100 nm), the solution colors change from red to yellow and green depending on the composition of the solvent mixture. Moreover, the above Q band was located at the border between the visible and near-IR regions, [Formula: see text]. its red shift could not be directly recognized by the human naked eye. Substituents on oxygen atoms were shown to influence phthalocyanine aggregation and thus affect near-IR absorption, with the observed near-IR solvatochromism providing a new strategy of color change in response to weak external stimuli.

New armed near-IR two-photon organic chromophores undergoing ESIPT and ‘naked eye’ fluorescence sensing to zinc ions

2015 ◽  
Vol 56 (21) ◽  
pp. 2758-2763 ◽  
Author(s):  
Xinchao Wang ◽  
Huiying Ma ◽  
Ge Ding ◽  
Yao Lu ◽  
Yulong Gong ◽  
...  
Keyword(s):  
Zinc Ions ◽  
Fluorescence Sensing ◽  
Organic Chromophores ◽  
Two Photon ◽  
Naked Eye ◽  
Near Ir

Surface Brightness Scale of Galactic Cepheids

1999 ◽  
Vol 190 ◽  
pp. 561-562
Author(s):  
G. P. Di Benedetto
Keyword(s):  
Surface Brightness ◽  
Variable Stars ◽  
Giant Stars ◽  
Near Ir

An accurate calibration of the surface brightness scaleSVas a function of the near-IR color (V–K) has been recently measured for non-variable Galactic dwarf and giant stars. It can be shown that this correlation can be applied to theSVscale of Galactic Cepheid variable stars, which are of major cosmological interest.

A thiourea additive-based quadruple cation lead halide perovskite with an ultra-large grain size for efficient perovskite solar cells

Nanoscale ◽  
2019 ◽  
Vol 11 (45) ◽  
pp. 21824-21833 ◽  
Author(s):  
Jyoti V. Patil ◽  
Sawanta S. Mali ◽  
Chang Kook Hong
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Inorganic Perovskite ◽  
Halide Perovskite ◽  
Lead Halide

Controlling the grain size of the organic–inorganic perovskite thin films using thiourea additives now crossing 2 μm size with >20% power conversion efficiency.

Plasmon-assisted interaction of Si with light, for cancer hyperthermia and electromagnetic energy harvest

2020 ◽  
Vol 92 (2) ◽  
pp. 20101
Author(s):  
Behnam Kheyraddini Mousavi ◽  
Morteza Rezaei Talarposhti ◽  
Farshid Karbassian ◽  
Arash Kheyraddini Mousavi
Keyword(s):  
Silicon Nanowires ◽  
Metallic Nanoparticles ◽  
Near Infrared ◽  
Optical Transition ◽  
Electromagnetic Energy ◽  
Energy Harvest ◽  
Absorption Enhancement ◽  
Ir Absorption ◽  
Absorption Mechanism ◽  
Near Ir

Metal-assisted chemical etching (MACE) is applied for fabrication of silicon nanowires (SiNWs). We have shown the effect of amorphous sheath of SiNWs by treating the nanowires with SF6 and the resulting reduction of absorption bandwidth, i.e. making SiNWs semi-transparent in near-infrared (IR). For the first time, by treating the fabricated SiNWs with copper containing HF∕H2O2∕H2O solution, we have generated crystalline nanowires with broader light absorption spectrum, up to λ = 1 μm. Both the absorption and photo-luminescence (PL) of the SiNWs are observed from visible to IR wavelengths. It is found that the SiNWs have PL at visible and near Infrared wavelengths, which may infer presence of mechanisms such as forbidden gap transitions other can involvement of plasmonic resonances. Non-radiative recombination of excitons is one of the reasons behind absorption of SiNWs. Also, on the dielectric metal interface, the absorption mechanism can be due to plasmonic dissipation or plasmon-assisted generation of excitons in the indirect band-gap material. Comparison between nanowires with and without metallic nanoparticles has revealed the effect of nanoparticles on absorption enhancement. The broader near IR absorption, paves the way for applications like hyperthermia of cancer while the optical transition in near IR also facilitates harvesting electromagnetic energy at a broad spectrum from visible to IR.

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