Cobalt Phthalocyanine-Sensitized Graphene–ZnO Composite: An Efficient Near-Infrared-Active Photothermal Agent

Neelgund, Gururaj M.; Oki, Aderemi

doi:10.1021/acsomega.8b03222

Cited by 30 publications

(13 citation statements)

References 41 publications

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“…ZnO is used in several applications such as photocatalysis, catalysis, antibacterial products, solar cells, medicines, opto-electronics, etc. [38,39]. The immense use of ZnO can be observed in photocatalysts, catalysts, and antibacterial agents, due to its biocompatibility, non-toxic, and excellent redox properties [40,41].…”

Section: Introductionmentioning

confidence: 99%

Manganese-Doped Zinc Oxide Nanostructures as Potential Scaffold for Photocatalytic and Fluorescence Sensing Applications

Thakur¹,

Sharma²,

Awasthi³

et al. 2020

Chemosensors

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Herein, we report the photocatalytic and fluorescence sensing applications of manganese-doped zinc oxide nanostructures synthesized by a solution combustion technique, using zinc nitrate as an oxidizer and urea as a fuel. The synthesized Mn-doped ZnO nanostructures have been analyzed in terms of their surface morphology, phase composition, elemental analysis, and optical properties with the help of scanning electron microscopy (SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and UV-Visible (UV-Vis) spectroscopy. A careful observation of the SEM micrograph reveals that the synthesized material was porous and grown in very high density. Due to a well-defined porous structure, the Mn-doped ZnO nanostructures can be used for the detection of ciprofloxacin, which was found to exhibit a significantly low limit of detection (LOD) value i.e., 10.05 µM. The synthesized Mn-doped ZnO nanostructures have been further analyzed for interfering studies, which reveals that the synthesized sensor material possesses very good selectivity toward ciprofloxacin, as it detects selectively even in the presence of other molecules. The synthesized Mn-doped ZnO nanostructures have been further analyzed for the photodegradation of methyl orange (MO) dye. The experimental results reveal that Mn-doped ZnO behaves as an efficient photocatalyst. The 85% degradation of MO has been achieved in 75 min using 0.15 g of Mn-doped ZnO nanostructures. The observed results clearly confirmed that the synthesized Mn-dopedZnO nanostructures are a potential scaffold for the fabrication of sensitive and robust chemical sensors as well as an efficient photocatalyst.

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Section: Introductionmentioning

confidence: 99%

Manganese-Doped Zinc Oxide Nanostructures as Potential Scaffold for Photocatalytic and Fluorescence Sensing Applications

Thakur¹,

Sharma²,

Awasthi³

et al. 2020

Chemosensors

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“…Porphyrins and phthalocyanines have been used as electrodes and have been reported for a wide range of reactions such as the ORR [32,[37][38][39][40], reduction of CO 2 [41][42][43][44][45], and the oxidation of H 2 O 2 and hydrazine [46,47] organic [48][49][50][51][52], biological [53,54] and inorganic compounds [55][56][57][58][59][60][61][62], as well as other forms of bio-mimicking [63,64]. They are also interesting since they may be readily bound to the surface of electrode materials such as carbon nanomaterials [23,28,34,48,49,[65][66][67][68][69][70][71][72][73] and inorganic materials [74][75][76] or polymerized [44,70,…”

mentioning

confidence: 99%

Penta-coordinated transition metal macrocycles as electrocatalysts for the oxygen reduction reaction

Govan

Orellana

Zagal

et al. 2020

J Solid State Electrochem

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The oxygen reduction reaction (ORR) is a highly important reaction in electrochemistry. The following short review details recent advances in novel non-precious metal catalysts containing transition metal macrocycles for use in the ORR. Unbound, many of these electrodes were found to generate high levels of side products such as O 2 − and H 2 O 2 via 2-electron processes, and for this reason, it is aimed to create systems which would favor a 4-electron process which would completely convert oxygen to H 2 O. The 4electron reduction of O 2 releases the most energy in a fuel cell. Novel catalytic materials containing metal macrocycles were created mimicking the structure of enzyme metal centers, the metal in the macrocycle bound to a fifth axial ligand. These structures were observed to exhibit improved catalytic activity, and in the case of cobalt, phthalocyanine systems were observed to move away from the inefficient 2-electron process towards the more complete 4-electron process in alkaline media. Both experimental results (XPS, EPR, cyclic voltammetry and polarization curves) and theoretical models were gathered for various pentacoordinate systems and various electronic effects of the axial ligand on metal center were proposed. Penta-coordinate macrocycles are an important tool for further manipulating and tuning the electronic behavior of transition metal centers for catalysis of the ORR.

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“…The ATR spectroscopy, as a mode of FTIR spectroscopy, was conducted to perform functional analysis on the coating, the results of which are shown in Figure C. The spectrum of ZnO/rGO shows a band at 1495 cm –1 (iii) wavelength due to the skeletal vibration of graphene, in addition to a broad absorption band at 3357 cm –1 (i) associated with the stretching vibrations of the hydroxyl groups of water molecules absorbed over the surface of ZnO/rGrO . The existing C–OH and COO– bonds of 3430 cm –1 (i) and 2360 cm –1 (ii), respectively, were found in the spectrum, which are rooted in the porosity and hygroscopic nature of graphene.…”

Section: Resultsmentioning

confidence: 99%

Highly Stable Buffer-Based Zinc Oxide/Reduced Graphene Oxide Nanosurface Chemistry for Rapid Immunosensing of SARS-CoV-2 Antigens

Haghayegh

Salahandish

Hassani

et al. 2022

ACS Appl. Mater. Interfaces

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The widespread and long-lasting effect of the COVID-19 pandemic has called attention to the significance of technological advances in the rapid diagnosis of SARS-CoV-2 virus. This study reports the use of a highly stable buffer-based zinc oxide/reduced graphene oxide (bbZnO/rGO) nanocomposite coated on carbon screen-printed electrodes for electrochemical immuno-biosensing of SARS-CoV-2 nuelocapsid (N-) protein antigens in spiked and clinical samples. The incorporation of a salt-based (ionic) matrix for uniform dispersion of the nanomixture eliminates multistep nanomaterial synthesis on the surface of the electrode and enables a stable single-step sensor nanocoating. The immuno-biosensor provides a limit of detection of 21 fg/mL over a linear range of 1–10 000 pg/mL and exhibits a sensitivity of 32.07 ohms·mL/pg·mm2 for detection of N-protein in spiked samples. The N-protein biosensor is successful in discriminating positive and negative clinical samples within 15 min, demonstrating its proof of concept used as a COVID-19 rapid antigen test.

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Cobalt Phthalocyanine-Sensitized Graphene–ZnO Composite: An Efficient Near-Infrared-Active Photothermal Agent

Cited by 30 publications

References 41 publications

Manganese-Doped Zinc Oxide Nanostructures as Potential Scaffold for Photocatalytic and Fluorescence Sensing Applications

Manganese-Doped Zinc Oxide Nanostructures as Potential Scaffold for Photocatalytic and Fluorescence Sensing Applications

Penta-coordinated transition metal macrocycles as electrocatalysts for the oxygen reduction reaction

Highly Stable Buffer-Based Zinc Oxide/Reduced Graphene Oxide Nanosurface Chemistry for Rapid Immunosensing of SARS-CoV-2 Antigens

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