Covalently modified graphene quantum dot using a thiourea based imprinted polymer for the selective electrochemical sensing of Hg(II) ions

Soman, Sithara; P.V, Aswathy; Kala, R.

doi:10.1007/s10965-021-02716-6

Cited by 27 publications

(10 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Conventional metal-based semiconductor quantum dots have already been proven to be a successful choice for optoeletronic devices, specifically dye sensitized solar cell (DSSC) and quantum dot solar cell (QDSC). , But despite of their good light-to-power conversion efficiency, the toxicity and poor photostability associated with it would be a major obstacle for its effective utilization. In this regard, graphene quantum dots (GQDs), a nonmetallic semiconductor, could be a promising choice for energy harvesting devices due to its obvious merits such as negligible toxicity, biocompatibility, structural tunability, ease of surface modification, large surface area, stable photoluminescence (PL), high carrier mobility, and accordant energy level alignment. , GQDs are disc shaped, zero-dimensional (0D) nanodots with single or few layers of graphene having a size between 4 and 15 nm. − Their diverse material attributes, such as quantum confinement effect, edge effect, excitation wavelength-dependent emission properties, up-conversion luminescence, chemical stability, enhanced quantum yield, solubility in aqueous as well as organic medium, and so forth, make them adequately suitable for various potential applications. − …”

Section: Introductionmentioning

confidence: 99%

Unravelling the Surface-State Assisted Ultrafast Charge Transfer Dynamics of Graphene Quantum Dot-Based Nanohybrids via Transient Absorption Spectroscopy

Sebastian

Pallikkara

Bhatt³

et al. 2022

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

Graphene quantum dots-based nanohybrids (GQD NHs) are considered to be a promising candidate for optoelectronic devices due to their tunable light absorption and pronounced carrier transfer properties. The mechanism of GQD exciton dynamics remains an open problem despite the substantial studies conducted so far. The carrier annihilation process occurring at a femtosecond time scale becomes the greatest hurdle in the path of GQD quantum efficiency. In this quest, we investigated a surface state-assisted photoinduced charge (electron/hole) transfer (PCT) in GQD-(p-methoxy aniline (POMe)/p-nitroaniline (PNO)) nanohybrids by using mainly ultrafast transient absorption spectroscopic technique. The ultrafast PCT time was found to be ∼0.3 ps (ps) and ∼0.4 ps for GQD/PNO and GQD/POMe NHs, respectively. The fastest kinetics observed for GQD/POMe among these systems reveals a more efficient PCT interaction in the GQD/POMe interface than that of GQD/PNO. The higher PCT rate constant (K PCT ) and high negative Gibbs free energy change (ΔG) values observed for GQD/POMe over GQD/PNO further validates the aforementioned results. Cyclic voltammetry along with theoretical studies reveal the thermodynamic viability of PCT in GQD NHs. Outcomes of this study fortify the comprehension of surface state-influenced PCT kinetics of GQD NHs and thus enlarge its optoelectronic applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Unravelling the Surface-State Assisted Ultrafast Charge Transfer Dynamics of Graphene Quantum Dot-Based Nanohybrids via Transient Absorption Spectroscopy

Sebastian

Pallikkara

Bhatt³

et al. 2022

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

show abstract

“…GQDs are highly electroactive and can reduce the overpotential of the analyte; therefore, they can be doped into MIP ECSs to enhance the current response [ 15 ]. In 2021, Soman et al used thiourea derivative-functionalized GQDs (GQDTU) as functional monomers, and prepared mercury ion-imprinted polymer materials (GQDTU-IIP) by using suspension polymerization technology, and with which being used to modify GCE, a novel nanosensor was synthesized for the electrochemical sensing of Hg(II) ions [ 114 ]. The preparation process is shown in Figure 10 .…”

Section: Application Of Nanomaterials In Hmiecssmentioning

confidence: 99%

Nanomaterials-Based Ion-Imprinted Electrochemical Sensors for Heavy Metal Ions Detection: A Review

Sun

Zhang

et al. 2022

Biosensors

View full text Add to dashboard Cite

Heavy metal ions (HMIs) pose a serious threat to the environment and human body because they are toxic and non-biodegradable and widely exist in environmental ecosystems. It is necessary to develop a rapid, sensitive and convenient method for HMIs detection to provide a strong guarantee for ecology and human health. Ion-imprinted electrochemical sensors (IIECSs) based on nanomaterials have been regarded as an excellent technology because of the good selectivity, the advantages of fast detection speed, low cost, and portability. Electrode surfaces modified with nanomaterials can obtain excellent nano-effects, such as size effect, macroscopic quantum tunneling effect and surface effect, which greatly improve its surface area and conductivity, so as to improve the detection sensitivity and reduce the detection limit of the sensor. Hence, the present review focused on the fundamentals and the synthetic strategies of ion-imprinted polymers (IIPs) and IIECSs for HMIs detection, as well as the applications of various nanomaterials as modifiers and sensitizers in the construction of HMIIECSs and the influence on the sensing performance of the fabricated sensors. Finally, the potential challenges and outlook on the future development of the HMIIECSs technology were also highlighted. By means of the points presented in this review, we hope to provide some help in further developing the preparation methods of high-performance HMIIECSs and expanding their potential applications.

show abstract

“…Despite these developments in this proposed sensor, there are still a few challenges that need to be addressed before it can be commercialized. A comparison of the electrode parameters of the published study [41][42][43][44][45][46] with the current electrode is given in Table 2.…”

Section: Real Sample Analysis By Pnmpy/nano-stannous(ii)wo 3 /Gce Sensormentioning

confidence: 99%

Sol-Gel Synthesis and Characterization of Highly Selective Poly(N-methyl pyrrole) Stannous(II)Tungstate Nano Composite for Mercury (Hg(II)) Detection

Khan

et al. 2022

Crystals

View full text Add to dashboard Cite

The sol-gel process was used to create a new type of polypyrrole-Stannous(II)tungstate nanocomposite by poly(N-methyl pyrrole (PNMPy) sol in Stannous(II)tungstate gel, produced separately using sodium silicotungstic acid and Tn(II)chloride. Tin(II)tungstate (SnWO3) was made by changing the mixing volume ratios of SnWO3 and with a constant amount of an organic polymer. The composite was characterized by TGA, XRD, FTIR, and SEM measurements. A commercially available glassy carbon electrode (GCE) was modified with PNMPy/nano-Stannous(II)WO3 nanocomposites to create a chemical sensor for selective detection of Hg2+ ions using an effective electrochemical methodology. In the I-V technique, selectively toxic Hg2+ ion was targeted selectively, which shows a rapid reaction toward PNMPy/nano-Stannous(II)WO3/Nafion/GCE sensor. It also demonstrates long-term stability, an ultra-low detection limit, exceptional sensitivity, and excellent reproducibility and repeatability. For 0.1 mM to 1.0 nM aqueous Hg2+ ion solution, a linear calibration plot (r2: 0.9993) was achieved, with a suitable sensitivity value of 2.8241 AM−1 cm−2 and an extraordinarily low detection limit (LOD) of 3.40.1 pM (S/N = 3). As a result, the cationic sensor modified by PNMPy/nano-Stannous(II)WO3/GCE could be a promising electrode.

show abstract

Covalently modified graphene quantum dot using a thiourea based imprinted polymer for the selective electrochemical sensing of Hg(II) ions

Cited by 27 publications

References 56 publications

Unravelling the Surface-State Assisted Ultrafast Charge Transfer Dynamics of Graphene Quantum Dot-Based Nanohybrids via Transient Absorption Spectroscopy

Unravelling the Surface-State Assisted Ultrafast Charge Transfer Dynamics of Graphene Quantum Dot-Based Nanohybrids via Transient Absorption Spectroscopy

Nanomaterials-Based Ion-Imprinted Electrochemical Sensors for Heavy Metal Ions Detection: A Review

Sol-Gel Synthesis and Characterization of Highly Selective Poly(N-methyl pyrrole) Stannous(II)Tungstate Nano Composite for Mercury (Hg(II)) Detection

Contact Info

Product

Resources

About