“A bridge over troubled gaps”: up-conversion driven photocatalysis for hydrogen generation and pollutant degradation by near-infrared excitation

2018 ◽  
Vol 54 (15) ◽  
pp. 1905-1908 ◽  
Author(s):  
P. Acosta-Mora ◽  
K. Domen ◽  
T. Hisatomi ◽  
H. Lyu ◽  
J. Méndez-Ramos ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Near Infrared ◽  
Hydrogen Generation ◽  
Organic Dyes ◽  
Pollutant Degradation ◽  
Present Evidence ◽  
Photon Conversion ◽  
Infrared Excitation

We present evidence of NIR-to-UV-VIS photon conversion for degradation of organic dyes and hydrogen and oxygen evolution.

scholarly journals Near infrared excitation and emission in rare earth MOFs via encapsulation of organic dyes

2018 ◽  
Vol 9 (42) ◽  
pp. 8099-8102 ◽  
Author(s):  
Chong Liu ◽  
Svetlana V. Eliseeva ◽  
Tian-Yi Luo ◽  
Patrick F. Muldoon ◽  
Stéphane Petoud ◽  
...  
Keyword(s):  
Rare Earth ◽  
Near Infrared ◽  
Organic Dyes ◽  
Biological Imaging ◽  
Diagnostic Window ◽  
Infrared Excitation

Dye RE3+-MOF hybrid exhibits both NIR excitation and emission within the biological diagnostic window, highlighting its potential for biological imaging.

Quasi-Continuous Wave Near-Infrared Excitation of Upconversion Nanoparticles for Optogenetic Manipulation ofC. elegans

Small ◽  
2016 ◽  
Vol 12 (13) ◽  
pp. 1732-1743 ◽  
Author(s):  
Akshaya Bansal ◽  
Haichun Liu ◽  
Muthu Kumara Gnanasammandhan Jayakumar ◽  
Stefan Andersson-Engels ◽  
Yong Zhang
Keyword(s):  
Near Infrared ◽  
Continuous Wave ◽  
Upconversion Nanoparticles ◽  
Infrared Excitation

The Rise of Near-Infrared Emitters: Organic Dyes, Porphyrinoids, and Transition Metal Complexes

2016 ◽  
Vol 374 (4) ◽  
Author(s):  
Andrea Barbieri ◽  
Elisa Bandini ◽  
Filippo Monti ◽  
Vakayil K. Praveen ◽  
Nicola Armaroli
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Near Infrared ◽  
Organic Dyes ◽  
Infrared Emitters

scholarly journals Sustainable, Rapid Synthesis of Bright-Luminescent CuInS2-ZnS Alloyed Nanocrystals: Multistage Nano-xenotoxicity Assessment and Intravital Fluorescence Bioimaging in Zebrafish-Embryos

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
S. Shashank Chetty ◽  
S. Praneetha ◽  
Sandeep Basu ◽  
Chetana Sachidanandan ◽  
A. Vadivel Murugan
Keyword(s):  
Large Scale ◽  
Near Infrared ◽  
Organic Dyes ◽  
Low Cost ◽  
Fluorescence Emission ◽  
Zebrafish Embryos ◽  
Fluorescence Bioimaging ◽  
Rapid Labeling

Abstract Near-infrared (NIR) luminescent CuInS2-ZnS alloyed nanocrystals (CIZS-NCs) for highly fluorescence bioimaging have received considerable interest in recent years. Owing, they became a desirable alternative to heavy-metal based-NCs and organic dyes with unique optical properties and low-toxicity for bioimaging and optoelectronic applications. In the present study, bright and robust CIZS-NCs have been synthesized within 5 min, as-high-as 230 °C without requiring any inert-gas atmosphere via microwave-solvothermal (MW-ST) method. Subsequently, the in vitro and in vivo nano-xenotoxicity and cellular uptake of the MUA-functionalized CIZS-NCs were investigated in L929, Vero, MCF7 cell lines and zebrafish-embryos. We observed minimal toxicity and acute teratogenic consequences upto 62.5 μg/ml of the CIZS-NCs in zebrafish-embryos. We also observed spontaneous uptake of the MUA-functionalized CIZS-NCs by 3 dpf older zebrafish-embryos that are evident through bright red fluorescence-emission at a low concentration of 7.8 μg/mL. Hence, we propose that the rapid, low-cost, large-scale “sustainable” MW-ST synthesis of CIZS-NCs, is an ideal bio-nanoprobe with good temporal and spatial resolution for rapid labeling, long-term in vivo tracking and intravital-fluorescence-bioimaging (IVBI).

scholarly journals Demonstrated Wavelength Portability of Raman Reference Data for Explosives and Chemical Detection

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Timothy J. Johnson ◽  
Yin-Fong Su ◽  
Kristin H. Jarman ◽  
Brenda M. Kunkel ◽  
Jerome C. Birnbaum ◽  
...  
Keyword(s):  
Near Infrared ◽  
Reference Data ◽  
Current Sensor ◽  
Data Sets ◽  
Reference Library ◽  
Wavelength Calibration ◽  
Intensity Response ◽  
Excitation Laser ◽  
Key Issues ◽  
Infrared Excitation

As Raman spectroscopy continues to evolve, questions arise as to the portability of Raman data: dispersive versus Fourier transform, wavelength calibration, intensity calibration, and in particular the frequency of the excitation laser. While concerns about fluorescence arise in the visible or ultraviolet, most modern (portable) systems use near-infrared excitation lasers, and many of these are relatively close in wavelength. We have investigated the possibility of porting reference data sets from one NIR wavelength system to another: We have constructed a reference library consisting of 145 spectra, including 20 explosives, as well as sundry other compounds and materials using a 1064 nm spectrometer. These data were used as a reference library to evaluate the same 145 compounds whose experimental spectra were recorded using a second 785 nm spectrometer. In 128 cases of 145 (or 88.3% including 20/20 for the explosives), the compounds were correctly identified with a mean “hit score” of 954 of 1000. Adding in criteria for when to declare a correct match versus when to declare uncertainty, the approach was able to correctly categorize 134 out of 145 spectra, giving a 92.4% accuracy. For the few that were incorrectly identified, either the matched spectra were spectroscopically similar to the target or the 785 nm signal was degraded due to fluorescence. The results indicate that imported data recorded at a different NIR wavelength can be successfully used as reference libraries, but key issues must be addressed: the reference data must be of equal or higher resolution than the resolution of the current sensor, the systems require rigorous wavelength calibration, and wavelength-dependent intensity response should be accounted for in the different systems.

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