Highly Selective and Rapid Naked-Eye Colorimetric Sensing and Fluorescent Studies of Cu2+ Ions Derived from Spherical Nanocellulose

2020 ◽  
Vol 2 (11) ◽  
pp. 5290-5299
Author(s):  
Bhagat Ram ◽  
Shivani Jamwal ◽  
Sunita Ranote ◽  
Ghanshyam S. Chauhan ◽  
Rohini Dharela
Keyword(s):  
Colorimetric Sensing ◽  
Naked Eye ◽  
Fluorescent Studies

scholarly journals Hyperchromatic structural color for perceptually enhanced sensing by the naked eye

2020 ◽  
Vol 117 (48) ◽  
pp. 30107-30117
Author(s):  
Tahmid H. Talukdar ◽  
Bria McCoy ◽  
Sarah K. Timmins ◽  
Taufiquar Khan ◽  
Judson D. Ryckman
Keyword(s):  
High Performance ◽  
Limit Of Detection ◽  
Form Factors ◽  
Optical Filters ◽  
Color Filter ◽  
Structural Color ◽  
Label Free ◽  
Colorimetric Sensing ◽  
Large Area ◽  
Naked Eye

Colorimetric sensors offer the prospect for on-demand sensing diagnostics in simple and low-cost form factors, enabling rapid spatiotemporal inspection by digital cameras or the naked eye. However, realizing strong dynamic color variations in response to small changes in sample properties has remained a considerable challenge, which is often pursued through the use of highly responsive materials under broadband illumination. In this work, we demonstrate a general colorimetric sensing technique that overcomes the performance limitations of existing chromatic and luminance-based sensing techniques. Our approach combines structural color optical filters as sensing elements alongside a multichromatic laser illuminant. We experimentally demonstrate our approach in the context of label-free biosensing and achieve ultrasensitive and perceptually enhanced chromatic color changes in response to refractive index changes and small molecule surface attachment. Using structurally enabled chromaticity variations, the human eye is able to resolve ∼0.1-nm spectral shifts with low-quality factor (e.g., Q ∼ 15) structural filters. This enables spatially resolved biosensing in large area (approximately centimeters squared) lithography-free sensing films with a naked eye limit of detection of ∼3 pg/mm2, lower than industry standard sensors based on surface plasmon resonance that require spectral or angular interrogation. This work highlights the key roles played by both the choice of illuminant and design of structural color filter, and it offers a promising pathway for colorimetric devices to meet the strong demand for high-performance, rapid, and portable (or point-of-care) diagnostic sensors in applications spanning from biomedicine to environmental/structural monitoring.

Size and shape regulated synthesis of silver nanocapsules for highly selective and sensitive ultralow bivalent copper ion sensor application

2017 ◽  
Vol 41 (10) ◽  
pp. 4006-4013 ◽  
Author(s):  
Balakumar Vellaichamy ◽  
Prakash Periakaruppan
Keyword(s):  
Copper Ions ◽  
Copper Ion ◽  
Colorimetric Sensing ◽  
Ion Sensor ◽  
Sensor Application ◽  
Size And Shape ◽  
Naked Eye ◽  
Bivalent Copper ◽  
Shape Controlled

The development of highly robust, quantitative, sensitive and naked eye colorimetric sensing of bivalent copper ions using bio-inspired synthesis of size and shape controlled silver nanocapsules (AgNCs) is reported herein.

scholarly journals Co nanoparticles decorated with N-doped carbon nanotubes as high-efficiency catalysts with intrinsic oxidase-like property for colorimetric sensing

RSC Advances ◽  
2021 ◽  
Vol 11 (63) ◽  
pp. 39966-39977
Author(s):  
Tao Chen ◽  
Jinmin Cao ◽  
Xiaofang Bao ◽  
Yu Peng ◽  
Li Liu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Ascorbic Acid ◽  
High Efficiency ◽  
Colorimetric Detection ◽  
Hybrid Nanocomposite ◽  
Colorimetric Sensing ◽  
Naked Eye ◽  
Co Nanoparticles

In this work, we designed a Co@N-CNTs hybrid nanocomposite as an oxidase mimic for the colorimetric detection of ascorbic acid with the naked eye.

Azo Schiff bases as colorimetric and fluorescent sensors for recognition of F−, Cd2+ and Hg2+ ions

2014 ◽  
Vol 6 (18) ◽  
pp. 7384-7393 ◽  
Author(s):  
Raziyeh Arabahmadi ◽  
Masoumeh Orojloo ◽  
Saeid Amani
Keyword(s):  
Fluorescence Spectroscopy ◽  
Charge Density ◽  
Schiff Bases ◽  
Electrochemical Techniques ◽  
Fluorescent Sensors ◽  
Spectral Change ◽  
Colorimetric Sensing ◽  
Anion Sensing ◽  
Receptor Molecule ◽  
Naked Eye

The optical and colorimetric sensing properties of H2L1–H2L3 for anions were investigated by the naked eye and UV-Vis and fluorescence spectroscopy. The spectral change of H2L1–H2L3 is due to the anion induced deprotonation and hence an increase in charge density and rigidity of the receptor molecule. The anion sensing abilities of the receptors toward halide anions were also monitored by electrochemical techniques.

Hyperchromatic Structural Color for Perceptually Enhanced Colorimetric Sensing by the Naked Eye

2021 ◽  
Author(s):  
Tahmid H. Talukdar ◽  
Bria McCoy ◽  
Sarah K. Timmins ◽  
Taufiquar Khan ◽  
Judson D. Ryckman
Keyword(s):  
Structural Color ◽  
Colorimetric Sensing ◽  
Naked Eye

scholarly journals A colorimetric sensing platform based on self-assembled 3D porous CeGONR nanozymes for label-free visual detection of organophosphate pesticides

2020 ◽  
Vol 1 (8) ◽  
pp. 2789-2796
Author(s):  
Liyun Lin ◽  
Huifang Ma ◽  
Chunliang Yang ◽  
Wuhai Chen ◽  
Shaodong Zeng ◽  
...  
Keyword(s):  
Visual Detection ◽  
Organophosphate Pesticides ◽  
Label Free ◽  
Colorimetric Sensing ◽  
Naked Eye ◽  
Synthetic Strategy ◽  
Sensing Platform ◽  
Self Assembled

A Ce(iii)-driven self-assembled synthetic strategy was developed to fabricate 3D porous nanozymes. A paper-based, naked eye visible, disposable inhibition enzymatic nanoplatform was developed to detect organophosphate pesticides.

Three novel Cu6S6 cluster-based coordination compounds: synthesis, framework modulation and the sensing of small molecules and Fe3+ ions

2016 ◽  
Vol 45 (29) ◽  
pp. 11883-11891 ◽  
Author(s):  
Jiang-Feng Song ◽  
Si-Zhe Li ◽  
Rui-Sha Zhou ◽  
Jia Shao ◽  
Xiao-Min Qiu ◽  
...  
Keyword(s):  
Small Molecules ◽  
Coordination Compounds ◽  
Light Emission ◽  
Red Light ◽  
Colorimetric Sensing ◽  
Naked Eye

Three novel Cu6S6 cluster-based coordination compounds all display strong red light emission and naked eye colorimetric sensing for nitrobenzene, 2-nitrotoluene and Fe3+ ions.

Distinctive Detection of Fe2+ and Fe3+ by Biosurfactant Capped Silver Nanoparticles via Naked Eye Colorimetric Sensing

2021 ◽  
Author(s):  
Kalaivani D ◽  
Noorjahan S E
Keyword(s):  
Silver Nanoparticles ◽  
Colorimetric Sensing ◽  
Naked Eye ◽  
Green Synthesized Silver Nanoparticles ◽  
Simple Materials

Explicit detection of iron as Fe2+ and Fe3+ in the biological and environment systems by simple materials and methods is crucial. In this study, green synthesized silver nanoparticles (AgNps) capable...

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