Polyaniline/Ag nanoparticles/graphene oxide nanocomposite fluorescent sensor for recognition of chromium (VI) ions

Ebrahim, Shaker; Shokry, Azza; Khalil, Marwa; Ibrahim, Hayam M.; Soliman, Moataz

doi:10.1038/s41598-020-70678-8

Cited by 59 publications

(51 citation statements)

References 41 publications

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“…In addition, it is observed that the peak at 2550 cm –1 related to the reaction of the S–H group of excess MPA with N-GQDs disappears. 31 …”

Section: Resultsmentioning

confidence: 99%

“…This confirms the formation of nanocrystals of N-GQDs. 31 , 38 − 40 In addition, the HRTEM images of the prepared CIS/ZnS QDs are highly crystalline and the size of the nanocrystals is estimated to be in the range of 3.18–4.57 nm. The interplanar spacing is 0.33 nm for the (112) plane.…”

Section: Resultsmentioning

confidence: 99%

“…The quantum efficiency (QE) was calculated using eq 2 . 31 The limit of detection (LOD) of cholesterol was estimated using eq 3 . 30 where SD and S are the standard deviation and slope, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Nanocomposite of CuInS/ZnS and Nitrogen-Doped Graphene Quantum Dots for Cholesterol Sensing

et al. 2021

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In this paper, nitrogen graphene quantum dots (N-GQDs) and copper indium sulfide/zinc sulfide (CIS/ZnS) QDs were synthesized via facile hydrothermal and aqueous solution routes, respectively. Herein, a fluorescent nanocomposite has been synthesized between N-GQDs and CIS/ZnS QDs in an aqueous phase. This nanocomposite was characterized by photoluminescence, Raman, and ultraviolet–visible (UV–vis) spectroscopies, high-resolution transmission electron microscopy (HRTEM), and X-ray diffraction (XRD). This fluorescent nanocomposite was developed as a highly sensitive, selective nonenzymatic cholesterol optical biosensor in 0.312–5 mM cholesterol. HRTEM micrographs confirmed the preparation of CIS/ZnS QDs and N-GQDs with average diameters of 3 and 5 nm, respectively. The as-prepared NG/CIS/ZnS QD nanocomposite had a high sensitivity for cholesterol with a wide linear range of concentration of 0.312–5 mM with an excellent correlation coefficient (R 2) of 0.9688 and limit of detection (LOD) of 0.222 mM.

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“…In addition, it is observed that the peak at 2550 cm –1 related to the reaction of the S–H group of excess MPA with N-GQDs disappears. 31 …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Nanocomposite of CuInS/ZnS and Nitrogen-Doped Graphene Quantum Dots for Cholesterol Sensing

et al. 2021

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“…Engineered nanoparticles are defined as a material has a particle size ranged from 1 to 100 nm 1 . Nanoscience recently plays an important role by providing new materials with unique characteristics for remediation/treatment and sensing applications 2 – 6 . The research field called “nanoecotoxicology” explores the impacts of nanoparticles on the organisms and their ecosystems.…”

Section: Introductionmentioning

confidence: 99%

“…Polyaniline (PANI) and its nanocomposites (NCs) with high stability, high electroactivity, high conductivity and low cost are candidate to apply in the fields of sensors 6 , 26 – 29 , energy storage 10 and water treatment 5 , 30 – 32 . Yslas et al reported that there is no toxicological effect of PANI nanofibers for Rhinella arenarum larvae exposed to PANI even at the highest concentration, 400 mg/L 33 .…”

Section: Introductionmentioning

confidence: 99%

Acute toxicity assessment of polyaniline/Ag nanoparticles/graphene oxide quantum dots on Cypridopsis vidua and Artemia salina

Shokry

Khalil

Ibrahim

et al. 2021

Sci Rep

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Nanotoxicology is argued and considered one of the emerging topics. In this study, polyaniline (PANI)/2-acrylamido-2-methylpropanesulfonic acid (AMPSA) capped silver nanoparticles (NPs)/graphene oxide (GO) quantum dots (QDs) nanocomposite (PANI/Ag (AMPSA)/GO QDs NC) as a nanoadsorbent has a potential for removal of toxic hexavalent chromium (Cr(VI)) ions from water. The acute toxicity of this NC was evaluated on Artemia salina and freshwater Ostracods (Cypridopsis vidua) larvae for 48 h. The measurements were made at 24 and 48 h with 3 repetitions. The 50% effective concentration (EC50) values of the NC were determined after the exposure of these organisms. According to the results of the optical microscope, it was found that both experimental organisms intake the NC. In the toxicity results of Ostracods, the NC had a highly toxic effect only at 250 mg/L after 48 h and the EC50 value was 157.6 ± 6.4 mg/L. For Artemia salina individuals, it was noted that they were less sensitive than the Ostracods and EC50 value was 476 ± 25.1 mg/L after 48 h. These results indicated that PANI/Ag (AMPSA)/GO QDs NC has low toxicity towards both investigated organisms.

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Fluorescent hydrogel of chitosan and gelatin cross‐linked with maleic acid for optical detection of heavy metals

Sethi

Medha

Singh

et al. 2021

J of Applied Polymer Sci

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A multi‐component, fluorescent hydrogel of chitosan and gelatin using maleic acid as a cross‐linking agent was fabricated with improved mechanical and thermal properties. The FTIR spectroscopy and SEM studies confirmed the formation of a cross‐linked and porous hydrogel. The XPS studies confirmed the presence of rich functionalities over the surface of hydrogel. The hybrid hydrogel possessed strong blue emission band centered at 438 nm when excited with an absorption band centered at 384 nm. The fluorescent hydrogel was tested for selective detection of different heavy metal ions including Cr (VI) in the aqueous solution. The strong complexation among the functional groups of hydrogel and metal ions led to the quenching of hydrogel's fluorescence. The fluorescence of hydrogel was quenched significantly in the presence of Cr (VI) ions in comparison to the other heavy metal ions. The fluorescence‐quenching efficiency displayed a linear response to the Cr (VI) concentration in the range of 1–14 nM with a lower detection limit of 0.12 nM. Embraced with good sensitivity and selectivity for Cr (VI) ions, the solid hydrogel with stable fluorescent properties holds a great potential in chemical sensing applications.

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Polyaniline/Ag nanoparticles/graphene oxide nanocomposite fluorescent sensor for recognition of chromium (VI) ions

Cited by 59 publications

References 41 publications

Nanocomposite of CuInS/ZnS and Nitrogen-Doped Graphene Quantum Dots for Cholesterol Sensing

Nanocomposite of CuInS/ZnS and Nitrogen-Doped Graphene Quantum Dots for Cholesterol Sensing

Acute toxicity assessment of polyaniline/Ag nanoparticles/graphene oxide quantum dots on Cypridopsis vidua and Artemia salina

Fluorescent hydrogel of chitosan and gelatin cross‐linked with maleic acid for optical detection of heavy metals

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