Effect of carbon coating on the electrochemical properties of Bi2WO6 nanoparticles by PVP-assisted sonochemical method

Nithya, V.; Selvan, R. Kalai; Vasylechko, L.; Sanjeeviraja, C.

doi:10.1007/s10800-015-0822-3

Cited by 13 publications

(9 citation statements)

References 64 publications

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“…XPS was used to analyze elements in laminar Bi 2 WO 6 , which is shown in Figure A. The peaks of Bi 4f, W 4f, and O 1s were detected at 159.4, 35.3, and 530.0 eV, respectively, which were consistent with the reported data and proved the existence of T Bi, W, and O elements. − In addition, Figure A(a–c) shows the high-resolution Bi 4f, W 4f, and O 1s XPS spectra of laminar Bi 2 WO 6 . As shown in Figure B, the Raman analysis of laminar Bi 2 WO 6 modified on a silicon substrate was performed.…”

Section: Resultsmentioning

confidence: 99%

Novel Single-Enzyme-Assisted Dual Recycle Amplification Strategy for Sensitive Photoelectrochemical MicroRNA Assay

Xia

Wang

et al. 2020

Anal. Chem.

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Herein, a novel single-enzyme-assisted dual recycle amplification strategy based on T7 exonuclease (T7 Exo) and a strand-displacement reaction (SDR) was designed to fabricate a photoelectrochemical (PEC) biosensor for sensitive microRNA-141 (miRNA-141) detection with the use of laminar bismuth tungstate (Bi2WO6) as photoactive material. Compared with a traditional enzyme-assisted dual recycle amplification strategy, the presented method could effectively refrain the enzyme interference reaction, reduce environmental sensitivity, and save cost. Here, hairpin DNA1 (H1) decorated on magnetic beads (MB) hybridized with target miRNA-141 to form an H1/miRNA-141 heteroduplex. With the introduction of hairpin DNA2 (H2)-labeled SiO2 (H2-SiO2), SDR was triggered between H2-SiO2 and H1, thus miRNA-141 was displaced from the H1/miRNA-141 heteroduplex and an H1/H2-SiO2 duplex was formed, realizing the reuse of the target. In the presence of T7 Exo, the H1/H2-SiO2 duplex was digested with the release of output DNA-SiO2. To enhance the target conversion rate, H1-MB was intactly released and cycled, which could initiate more T7 Exo digestion and free abundant output DNA-SiO2. Through such a process, a tiny miRNA-141 could induce substantial output DNA-SiO2, effectively improving the target amplification efficiency and detection sensitivity of a PEC biosensor. Furthermore, Bi2WO6 was modified on an electrode to provide a superior initial PEC signal due to its excellent electronic transformation capacity. With the introduction of output DNA-SiO2, the hairpin structure of H3 on the electrode was opened, making SiO2 close to the electrode surface, which significantly decreases the PEC signal. This work first established the PEC biosensor featuring a single-enzyme-assisted dual recycle amplification process for sensitive detection of biomarkers.

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Section: Resultsmentioning

confidence: 99%

Novel Single-Enzyme-Assisted Dual Recycle Amplification Strategy for Sensitive Photoelectrochemical MicroRNA Assay

Xia

Wang

et al. 2020

Anal. Chem.

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“…Energy-dispersive X-ray spectroscopy (EDS) (Figure 1d) and Raman spectrum (Figure 1e) analysis of the as-obtained samples further confirmed the successful preparation of Bi 2 WO 6 . 47,48 The chemical compositions of the as-prepared Bi 2 WO 6 nanoplates were analyzed using XPS (Figure 1f). Figure 1g,h presents the high-resolution Bi 4f and W 4f XPS spectra of the Bi 2 WO 6 nanoplates.…”

Section: Synthesis and Characterization Of Pvp−bi 2 Womentioning

confidence: 99%

Bi₂WO₆ Semiconductor Nanoplates for Tumor Radiosensitization through High-Z Effects and Radiocatalysis

Zang

Gong

Mei

et al. 2019

ACS Appl. Mater. Interfaces

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The radioresistance of tumor cells is considered to be an Achilles' heel of cancer radiotherapy. Thus, an effective and biosafe radiosensitizer is highly desired but hitherto remains a big challenge. With the rapid progress of nanomedicine, multifunctional inorganic nanoradiosensitizers offer a new route to overcome the radioresistance and enhance the efficacy of radiotherapy. Herein, poly(vinylpyrrolidone) (PVP)-modified Bi 2 WO 6 nanoplates with good biocompatibility were synthesized through a simple hydrothermal process and applied as a radiosensitizer for the enhancement of radiotherapy for the first time. On the one hand, the high-Z elements Bi (Z = 83) and W (Z = 74) endow PVP−Bi 2 WO 6 with better X-ray energy deposition performance and thus enhance radiation-induced DNA damages. On the other hand, Bi 2 WO 6 semiconductors exhibit significant photocurrent and photocatalytic-like radiocatalytic activity under X-ray irradiation, giving rise to the effective separation of electron/hole (e − /h + ) pairs and subsequently promoting the generation of cytotoxic reactive oxygen species, especially hydroxyl radicals ( • OH). The γ-H2AX and clonogenic assays demonstrated that PVP− Bi 2 WO 6 could efficiently increase cellular DNA damages and colony formations under X-ray irradiation. These versatile features endowed PVP−Bi 2 WO 6 nanoplates with enhanced radiotherapy efficacy in animal models. In addition, Bi 2 WO 6 nanoplates can also serve as good X-ray computed tomography imaging contrast agents. Our findings provide an alternative nanotechnology strategy for tumor radiosensitization through simultaneous radiation energy deposition and radiocatalysis.

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“…The development of a supercapacitor with a high-capacity energy storage system bridges the gap between batteries and conventional capacitors in terms of energy and power density for high-power applications. 2,3 Pseudocapacitors have a higher capacitance because of the reversible surface faradaic redox reactions for charge storage, while electrical double-layer capacitors (EDLC) utilize the electrical charge at the electrode and electrolyte interface.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electrochemical Performance of Mn3O4/Multiwalled Carbon Nanotube Nanocomposite for Supercapacitor Applications

Abirami

Kabilan²,

Nagaraju

et al. 2021

J. Electron. Mater.

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Mn 3 O 4 /multiwalled carbon nanotube (MWCNT) nanocomposites were synthesized via a facile ultrasonic method, using manganese chloride as a precursor at room temperature for supercapacitor applications. The nanocomposites were characterized by powder x-ray diffraction (XRD), transmission electron microscopy (TEM) and field emission scanning electron microscopy (FE-SEM), respectively. TEM images revealed that the Mn 3 O 4 nanoparticles were highly dispersed on the surface of the MWCNT. Cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS) were performed for the Mn 3 O 4 /MWCNT nanocomposites using 1 M Na 2 SO 4 aqueous solutions as the electrolyte in order to find the suitability of the material for supercapacitor applications. The electrochemical results exhibit improved performance for the Mn 3 O 4 /MWCNT composite electrode compared to pristine Mn 3 O 4 nanoparticles owing to its structural superiority. The specific capacitance (C s ) of Mn 3 O 4 /MWCNT nanocomposites and pristine Mn 3 O 4 was about 473 F g −1 and 259 F g −1 , respectively, at a current density of 1 A g −1 . The Mn 3 O 4 /MWCNT composite sustains a very strong cyclic performance after 5000 cycles. The capacitance retention of the composite electrode shows highly stable performance confirming its suitability as lasting electrode material for supercapacitor applications.

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Effect of carbon coating on the electrochemical properties of Bi2WO6 nanoparticles by PVP-assisted sonochemical method

Cited by 13 publications

References 64 publications

Novel Single-Enzyme-Assisted Dual Recycle Amplification Strategy for Sensitive Photoelectrochemical MicroRNA Assay

Novel Single-Enzyme-Assisted Dual Recycle Amplification Strategy for Sensitive Photoelectrochemical MicroRNA Assay

Bi₂WO₆ Semiconductor Nanoplates for Tumor Radiosensitization through High-Z Effects and Radiocatalysis

Enhanced Electrochemical Performance of Mn3O4/Multiwalled Carbon Nanotube Nanocomposite for Supercapacitor Applications

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Effect of carbon coating on the electrochemical properties of Bi2WO6 nanoparticles by PVP-assisted sonochemical method

Cited by 13 publications

References 64 publications

Novel Single-Enzyme-Assisted Dual Recycle Amplification Strategy for Sensitive Photoelectrochemical MicroRNA Assay

Novel Single-Enzyme-Assisted Dual Recycle Amplification Strategy for Sensitive Photoelectrochemical MicroRNA Assay

Bi2WO6 Semiconductor Nanoplates for Tumor Radiosensitization through High-Z Effects and Radiocatalysis

Enhanced Electrochemical Performance of Mn3O4/Multiwalled Carbon Nanotube Nanocomposite for Supercapacitor Applications

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Bi₂WO₆ Semiconductor Nanoplates for Tumor Radiosensitization through High-Z Effects and Radiocatalysis