Unsymmetrical Squaraine Dye-Based Organic Photodetector Exhibiting Enhanced Near-Infrared Sensitivity

2020 ◽  
Vol 124 (39) ◽  
pp. 21730-21739 ◽  
Author(s):  
Guruprasad M. Somashekharappa ◽  
Chinju Govind ◽  
Vijith Pulikodan ◽  
Megha Paul ◽  
Manoj A. G. Namboothiry ◽  
...  
Keyword(s):  
Near Infrared ◽  
Squaraine Dye ◽  
Organic Photodetector

scholarly journals Near-IR squaraine dye–loaded gated periodic mesoporous organosilica for photo-oxidation of phenol in a continuous-flow device

2015 ◽  
Vol 1 (8) ◽  
pp. e1500390 ◽  
Author(s):  
Parijat Borah ◽  
Sivaramapanicker Sreejith ◽  
Palapuravan Anees ◽  
Nishanth Venugopal Menon ◽  
Yuejun Kang ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Heterogeneous Catalysts ◽  
Near Infrared ◽  
Periodic Mesoporous Organosilica ◽  
Photo Oxidation ◽  
Mesoporous Organosilica ◽  
Squaraine Dye ◽  
Flow Device ◽  
Catalytically Active ◽  
Oxidation Of Phenol

Periodic mesoporous organosilica (PMO) has been widely used for the fabrication of a variety of catalytically active materials. We report the preparation of novel photo-responsive PMO with azobenzene-gated pores. Upon activation, the azobenzene gate undergoes trans-cis isomerization, which allows an unsymmetrical near-infrared squaraine dye (Sq) to enter into the pores. The gate closure by cis-trans isomerization of the azobenzene unit leads to the safe loading of the monomeric dye inside the pores. The dye-loaded and azobenzene-gated PMO (Sq-azo@PMO) exhibits excellent generation of reactive oxygen species upon excitation at 664 nm, which can be effectively used for the oxidation of phenol into benzoquinone in aqueous solution. Furthermore, Sq-azo@PMO as the catalyst was placed inside a custom-built, continuous-flow device to carry out the photo-oxidation of phenol to benzoquinone in the presence of 664-nm light. By using the device, about 23% production of benzoquinone with 100% selectivity was achieved. The current research presents a prototype of transforming heterogeneous catalysts toward practical use.

Control of Crystallinity in PbPc:C60 Blend Film and Application for Inverted Near-Infrared Organic Photodetector

2018 ◽  
Vol 10 (30) ◽  
pp. 25614-25620 ◽  
Author(s):  
Min-Soo Choi ◽  
Sangmin Chae ◽  
Hyo Jung Kim ◽  
Jang-Joo Kim
Keyword(s):  
Near Infrared ◽  
Blend Film ◽  
Organic Photodetector

Near-infrared absorbing squaraine dye with extended π conjugation for dye-sensitized solar cells

2013 ◽  
Vol 60 ◽  
pp. 672-678 ◽  
Author(s):  
Claudio Magistris ◽  
Stefano Martiniani ◽  
Nadia Barbero ◽  
Jinhyung Park ◽  
Caterina Benzi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Near Infrared ◽  
Dye Sensitized Solar Cells ◽  
Dye Sensitized ◽  
Squaraine Dye ◽  
Sensitized Solar Cells

scholarly journals Near-Infrared Squaraine Dye Encapsulated Micelles for in Vivo Fluorescence and Photoacoustic Bimodal Imaging

ACS Nano ◽  
2015 ◽  
Vol 9 (6) ◽  
pp. 5695-5704 ◽  
Author(s):  
Sivaramapanicker Sreejith ◽  
James Joseph ◽  
Manjing Lin ◽  
Nishanth Venugopal Menon ◽  
Parijat Borah ◽  
...  
Keyword(s):  
Near Infrared ◽  
In Vivo Fluorescence ◽  
Bimodal Imaging ◽  
Squaraine Dye

scholarly journals Near Infrared Fluorophore-Tagged Chloroquine in Plasmodium falciparum Diagnostic Imaging

2018 ◽  
Author(s):  
Li Yan Chan ◽  
Joshua Ding Wei Teo ◽  
Kevin Shyong-Wei Tan ◽  
Keitaro Sou ◽  
Wei Lek Kwan ◽  
...  
Keyword(s):  
Plasmodium Falciparum ◽  
Near Infrared ◽  
Inhibitory Concentration ◽  
Drug Efficacy ◽  
Chloroquine Resistance ◽  
Combination Therapies ◽  
Squaraine Dye ◽  
Effective Inhibition ◽  
Drug Treatments ◽  
Falciparum Parasite

Chloroquine was among the first of several effective drug treatments against malaria until the onset of chloroquine resistance. In light of diminished clinical efficacy of chloroquine as an antimalarial therapeutic, there is potential in efforts to adapt chloroquine for other clinical applications, such as in combination therapies and in diagnostics. In this context, we designed and synthesized a novel asymmetrical squaraine dye coupled with chloroquine (SQR1-CQ). In this study, SQR1-CQ was used to label live Plasmodium falciparum (P. falciparum) parasite cultures of varying sensitivities towards chloroquine. SQR1-CQ positively stained ring, mature trophozoite and schizont stages of both chloroquine–sensitive and chloroquine–resistant P. falciparum strains. In addition, SQR1-CQ exhibited significantly higher fluorescence, when compared to a chloroquine-BODIPY (borondipyrromethene) conjugate. We also achieved successful SQR1-CQ labelling of P. falciparum directly on thin blood smear preparations. Drug efficacy experiments measuring half-maximal inhibitory concentration (IC50) showed lower concentration of effective inhibition against resistant strain K1 by SQR1-CQ compared to conventional chloroquine. Taken together, the versatile and highly fluorescent labelling capability of SQR1-CQ and promising preliminary IC50 findings potentiates it to be further developed as a promising diagnostic bioimaging tool with drug efficacy against chloroquine-resistant P. falciparum.

A trap-assisted ultrasensitive near-infrared organic photomultiple photodetector based on Y-type titanylphthalocyanine nanoparticles

2016 ◽  
Vol 4 (24) ◽  
pp. 5584-5592 ◽  
Author(s):  
Xiaolong Li ◽  
Shirong Wang ◽  
Yin Xiao ◽  
Xianggao Li
Keyword(s):  
Near Infrared ◽  
Dip Coating ◽  
Organic Photodetector

An ultrasensitive near-infrared organic photodetector with an EQE of 354 200% and a photoresponsivity of 2227 A W−1 has been fabricated by dip-coating.

scholarly journals Near Infrared Fluorophore-Tagged Chloroquine in Plasmodium falciparum Diagnostic Imaging

Molecules ◽  
2018 ◽  
Vol 23 (10) ◽  
pp. 2635 ◽  
Author(s):  
Li Chan ◽  
Joshua Teo ◽  
Kevin Tan ◽  
Keitaro Sou ◽  
Wei Kwan ◽  
...  
Keyword(s):  
Plasmodium Falciparum ◽  
Near Infrared ◽  
Inhibitory Concentration ◽  
Drug Efficacy ◽  
Chloroquine Resistance ◽  
Squaraine Dye ◽  
Effective Inhibition ◽  
Drug Treatments ◽  
Further Development ◽  
Falciparum Parasite

Chloroquine was among the first of several effective drug treatments against malaria until the onset of chloroquine resistance. In light of diminished clinical efficacy of chloroquine as an antimalarial therapeutic, there is potential in efforts to adapt chloroquine for other clinical applications, such as in combination therapies and in diagnostics. In this context, we designed and synthesized a novel asymmetrical squaraine dye coupled with chloroquine (SQR1-CQ). In this study, SQR1-CQ was used to label live Plasmodium falciparum (P. falciparum) parasite cultures of varying sensitivities towards chloroquine. SQR1-CQ positively stained ring, mature trophozoite and schizont stages of both chloroquine–sensitive and chloroquine–resistant P. falciparum strains. In addition, SQR1-CQ exhibited significantly higher fluorescence, when compared to the commercial chloroquine-BODIPY (borondipyrromethene) conjugate CQ-BODIPY. We also achieved successful SQR1-CQ labelling of P. falciparum directly on thin blood smear preparations. Drug efficacy experiments measuring half-maximal inhibitory concentration (IC50) showed lower concentration of effective inhibition against resistant strain K1 by SQR1-CQ compared to conventional chloroquine. Taken together, the versatile and highly fluorescent labelling capability of SQR1-CQ and promising preliminary IC50 findings makes it a great candidate for further development as diagnostic tool with drug efficacy against chloroquine-resistant P. falciparum.

Efficient near infrared fluorescence detection of elastase enzyme using peptide-bound unsymmetrical squaraine dye

2017 ◽  
Vol 27 (17) ◽  
pp. 4024-4029 ◽  
Author(s):  
Maryala Saikiran ◽  
Daisuke Sato ◽  
Shyam S. Pandey ◽  
Shuzi Hayase ◽  
Tamaki Kato
Keyword(s):  
Fluorescence Detection ◽  
Near Infrared ◽  
Near Infrared Fluorescence ◽  
Squaraine Dye
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