Search for: ratiometric-fluorescence-sensors
Article Analytical Methods ; Volume 9, Issue 23 , 2017 , Pages 3505-3512 ; 17599660 (ISSN) ; Hormozi Nezhad, M. R ; Sharif University of Technology
A simple and effective ratiometric fluorescence sensor for selective detection of dopamine (DA) in alkaline media has been developed by simply mixing thioglycolic acid (TGA) functionalized orange fluorescent cadmium telluride (CdTe) quantum dots (QDs) with amino-functionalized blue fluorescent carbon nanodots (CDs). Under a single excitation wavelength of 365 nm, the sensor exhibits dual-emissions centered at 445 and 603 nm. The fluorescence of CdTe QDs is selectively quenched by DA, whereas the fluorescence of CDs is insensitive to the analyte. In the presence of different amounts of DA, the variations in the dual emission intensity ratios exhibit a continuous color change from pink to...
A nanopaper-based artificial tongue: a ratiometric fluorescent sensor array on bacterial nanocellulose for chemical discrimination applications, Article Nanoscale ; Volume 10, Issue 5 , February , 2018 , Pages 2492-2502 ; 20403364 (ISSN) ; Golmohammadi, H ; Hormozi Nezhad, M. R ; Sharif University of Technology
Royal Society of Chemistry 2018
In the present study, a ratiometric fluorescent sensor array as an artificial tongue has been developed on a nanopaper platform for chemical discrimination applications. The bacterial cellulose (BC) nanopaper was utilized for the first time as a novel, flexible, and transparent substrate in the optical sensor arrays for developing high-performance artificial tongues. To fabricate this platform, the hydrophobic walls on the BC nanopaper substrates were successfully created using a laser printing technology. In addition, we have used the interesting photoluminescence (PL) properties of an immobilized ratiometric probe (carbon dot-Rhodamine B (CD-RhB) nanohybrids) on the nanopaper platform to...
Ratiometric fluorescent nanoprobes for visual detection: Design principles and recent advances - A review, Article Analytica Chimica Acta ; Volume 1079 , 2019 , Pages 30-58 ; 00032670 (ISSN) ; Ghasemi, F ; Abbasi Moayed, S ; Shahrajabian, M ; Fahimi Kashani, N ; Jafarinejad, S ; Farahmand Nejad, M. A ; Hormozi Nezhad, M. R ; Sharif University of Technology
Elsevier B.V 2019
Signal generation techniques for visual detection of analytes have received a great deal of attention in various sensing fields. These approaches are considered to be advantageous when instrumentation cannot be employed, such as for on-site assays, point-of-care tests, and he althcare diagnostics in resource-constrained areas. Amongst various visual detection approaches explored for non-invasive quantitative measurements, ratiometric fluorescence sensing has received particular attention as a potential method to overcome the limitations of intensity-based probes. This technique relies on changes in the intensity of two or more emission bands (induced by an analyte), resulting in an effective...