Highly selective fluorescent chemosensor for detection of Fe3+ based on Fe3O4@ZnO

Abstract

The combination of fluorescent nanoparticles and specific molecular probes appears to be a promising strategy for developing fluorescent nanoprobes. In this work, L-cysteine (L-Cys) capped Fe3O4@ZnO core-shell nanoparticles were synthesized for the highly selective detection of Fe3+. The proposed nanoprobe shows excellent fluorescent property and high selectivity for Fe3+ due to the binding affinity of L-Cys with Fe3+. The binding of Fe3+ to the nanoprobe induces an apparent decrease of the fluorescence. Thus a highly selective fluorescent chemosensor for Fe3+ was proposed based on Fe3O4@ZnO nanoprobe. The magnetism of the nanoprobe enables the facile separation of bound Fe3+ from the sample solution with an external magnetic field, which effectively reduces the interference of matrix. The detection limit was 3 nmol L−1 with a rapid response time of less than 1 min. The proposed method was applied to detect Fe3+ in both serum and wastewater samples with acceptable performance. All above features indicated that the proposed fluorescent probe as sensing platform held great potential in applications of biological and analytical field.

Development of Highly Efficient Dual Sensor Based on Carbon Dots for Direct Estimation of Iron and Fluoride Ions in Drinking Water

“…Therefore, research into new solutions for the estimation of low‐level concentrations of Fe 3+ and F ‐ ions in aqueous medium has become an essential need, aims to surpass existing commercial devices in their accessibility to non‐expert users who require regular, laboratory‐free sampling, such as remote populations in areas where chronic Fe 3+ and F − toxicity is endemic. To date the simultaneous detection of both Fe 3+ and F ‐ ions in aqueous media is limited in the literature; however several methods have been reported for detection of Fe 3+ and F ‐ ions separately ,. The recently reported methods for the detection of F ‐ include molecular complexes exhibiting turn‐on, turn‐off, or ratio‐metric color changes.…”

“…On the other hand few reports have been found in the literature for the quantitative as well as selective estimating of both Fe 3+ and F ‐ ions ,. However, most of the reported methods’ have several limitations in real‐world use, such as the detection procedures is highly time taking, used sophisticated analytical methods, low sensitivity and in certain cases an instability of the applications ,. Although, among these reported methods, the most favorable method is fluorescence quenching and “Turn on” fluorescence based due to its ease of operation, high sensitivity and selectivity.…”

Cationic‐Polymer‐Functionalized Zinc Oxide Quantum Dots: Preparation and Application to Iron(II) Ion Detection

“…The corresponding linear regression equation is F 0 /F =0.2153 [Fe 2+ ] (μM) + 0.9418. The limit of detection (LOD), calculated following the concentration of analyte giving the fluorescence intensity equal to F 0 ‐3×standard deviation of F 0 , was 0.34 μM (n=10) ,. The limit of quantitation (LOQ), measured as the concentration of analyte giving the fluorescence intensity equal to F 0 ‐10×standard deviation of F 0 , was estimated to be 0.51 μM ,.…”

“…Nowadays, quantum dots (QDs) ‐ semiconductor nanocrystals (1∼20 nm) exhibiting distinctive photoluminescence (PL) properties ‐ have been extensively used for fluorescent biosensing, bioimaging, drug delivery and catalysis because of their several favorable characteristics including broad excitation range, size‐tunable emission, excellent photostability and brightness . Among group II–VI QDs, ZnO QDs possess advantages over traditional QDs such as CdSe and CdTe QDs since they are inexpensive, nontoxic, and compatible with biological systems .…”

Rutin-modified silver nanoparticles as a chromogenic probe for the selective detection of Fe3+in aqueous medium

“…9,10 In the last decade, nanoscaled materials have been reported as selective probes for metal ions, including Fe 3+ . [11][12][13][14][15][16][17][18][19][20][21][22][23][24] Silver nanoparticles (AgNPs) are of particular interest because of the affordable price of starting materials, ease of controlling size and morphology, possibility to functionalize their surface with organic molecules, and optical properties that enable detection of a variety of analytes via simple UV-vis spectroscopy and digital image analysis. Furthermore, applications of AgNPs are also biotechnologically relevant due to the possibility of green synthetic protocols, including the use of plant extracts, 25 natural sources, 26 glycerol, 27 among others.…”