In-situ hydrothermal fabrication and photocatalytic behavior of ZnO/reduced graphene oxide nanocomposites with varying graphene oxide concentrations

Tuấn, Phạm Văn; Phương, Trần Thị Thu; Tan, Vu Thi; Sang, Nguyen Xuan; Khiem, Tran Ngoc

doi:10.1016/j.mssp.2020.105114

Cited by 39 publications

(22 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the average crystallite size of the doped sample (~19.77 nm) was slightly decreased in comparison to that of the pure ZnO (~ 20.68 nm). To further study the doping effect on crystallite ZnO structure, a modified Williamson-Hall (W-H) method with uniform deformation model (UDM) was applied [5,14,15]. We started at the following equation [16]:…”

Section: Phase and Structurementioning

confidence: 99%

“…Furthermore, the decrease of recombination rate of electron-hole pair is an important task to be carried out with this material, especially to avoid its large exciton binding energy. Hence, previous reports showed that the photocatalytic activity of ZnO was enhanced by compositing with other semiconductors [3,4], carbon-based materials [5,6], or by doping with other metal and non-metal ions [7 -9]. These experiments were targeted to form a heterojunction of the semiconductor host and the other materials which have showed advantages in photocatalytic enhancement in many studies.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

ON THE CONTRIBUTION FACTORS OF ENHANCED PHOTOCATALYTIC ACTIVITY OF DOPED SEMICONDUCTORS: STRUCTURAL AND OPTICAL INTVESTIGATION OF CU2+ DOPED ZnO NANOPARTICLE

Sang

Quynh

Anh

2021

JST

Self Cite

View full text Add to dashboard Cite

As a traditional direct bandgap oxide semiconductor, ZnO, showed as a promising photocatalytic candidate. Researchers worldwide reported many possibilities to improve its photocatalytic activity such as doped with metal, non-metal ions. As a result of heterojunction formation between ZnO and its intentional impurity, previous reports showed beneficial characteristics for enhancing photocatalytic activity in these ZnO-based materials, i.e. bandgap narrowing, recombination rate of photoelectron-hole prolonging, visible light absorption improving. This work will present the photocatalytic acitivity improvement of ZnO when doping with ion Cu2+ and try to illustrate the crucial photocatalytic enhancement factors.

show abstract

Section: Phase and Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

ON THE CONTRIBUTION FACTORS OF ENHANCED PHOTOCATALYTIC ACTIVITY OF DOPED SEMICONDUCTORS: STRUCTURAL AND OPTICAL INTVESTIGATION OF CU2+ DOPED ZnO NANOPARTICLE

Sang

Quynh

Anh

2021

JST

Self Cite

View full text Add to dashboard Cite

show abstract

“…GO prepared by a modified Hummers process is thoroughly mixed with the solution of zinc salt and alkali hydroxide using either water or organic solvent [240]. The resulting solution is then treated hydrothermally [173,241], or solvothermally [242][243][244][245]. The oxygenated groups of GO are largely removed from graphene sheet during heating, leading to the formation of RGO [172,240,241,244].…”

Section: Hydrothermal/solvothermal Synthesismentioning

confidence: 99%

“…The resulting solution is then treated hydrothermally [173,241], or solvothermally [242][243][244][245]. The oxygenated groups of GO are largely removed from graphene sheet during heating, leading to the formation of RGO [172,240,241,244]. In a certain case, ZnO NPs synthesized from co-precipitation is added directly to the GO solution [246].…”

Section: Hydrothermal/solvothermal Synthesismentioning

confidence: 99%

Recent Advances in Zinc Oxide Nanostructures with Antimicrobial Activities

Liao

Tjong

2020

IJMS

View full text Add to dashboard Cite

This article reviews the recent developments in the synthesis, antibacterial activity, and visible-light photocatalytic bacterial inactivation of nano-zinc oxide. Polycrystalline wurtzite ZnO nanostructures with a hexagonal lattice having different shapes can be synthesized by means of vapor-, liquid-, and solid-phase processing techniques. Among these, ZnO hierarchical nanostructures prepared from the liquid phase route are commonly used for antimicrobial activity. In particular, plant extract-mediated biosynthesis is a single step process for preparing nano-ZnO without using surfactants and toxic chemicals. The phytochemical molecules of natural plant extracts are attractive agents for reducing and stabilizing zinc ions of zinc salt precursors to form green ZnO nanostructures. The peel extracts of certain citrus fruits like grapefruits, lemons and oranges, acting as excellent chelating agents for zinc ions. Furthermore, phytochemicals of the plant extracts capped on ZnO nanomaterials are very effective for killing various bacterial strains, leading to low minimum inhibitory concentration (MIC) values. Bioactive phytocompounds from green ZnO also inhibit hemolysis of Staphylococcus aureus infected red blood cells and inflammatory activity of mammalian immune system. In general, three mechanisms have been adopted to explain bactericidal activity of ZnO nanomaterials, including direct contact killing, reactive oxygen species (ROS) production, and released zinc ion inactivation. These toxic effects lead to the destruction of bacterial membrane, denaturation of enzyme, inhibition of cellular respiration and deoxyribonucleic acid replication, causing leakage of the cytoplasmic content and eventual cell death. Meanwhile, antimicrobial activity of doped and modified ZnO nanomaterials under visible light can be attributed to photogeneration of ROS on their surfaces. Thus particular attention is paid to the design and synthesis of visible light-activated ZnO photocatalysts with antibacterial properties

show abstract

“…There is a demand for enhancing the adsorption of biomolecules (such as dengue proteins), and amine-reduced graphene oxide (NH 2 rGO) nanocomposites are beneficial to bind directly to a globular-shaped polyamidoamine (PAMAM) dendrimer without affecting their biological activity. In particular, many authors have demonstrated the capability of rGO as a sensing film because of its unique physiochemical properties including good reaction yields, excellent stability, reliable preparation, large surface areas, and good biocompatibility [ 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ]. This NH 2 rGO–PAMAM composite is believed to have a great sensing performance in detecting and quantifying the dengue virus.…”

Section: Introductionmentioning

confidence: 99%

An Optical Sensor for Dengue Envelope Proteins Using Polyamidoamine Dendrimer Biopolymer-Based Nanocomposite Thin Film: Enhanced Sensitivity, Selectivity, and Recovery Studies

et al. 2021

View full text Add to dashboard Cite

This paper proposes a novel idea to enhance the sensitivity and selectivity of surface plasmon resonance (SPR) optical sensor for detection of dengue virus type-2 envelope proteins (DENV-2 E-proteins) using polyamidoamine (PAMAM) dendrimer biopolymer-based nanocomposite thin film. For this purpose, two ranges of DENV-2 E-protein concentrations, i.e., 0.000008–0.0001 nM and 0.00008–0.005 nM were evaluated, and the lowest detectable concentration was achieved at 0.00008 nM. The incorporation of PAMAM dendrimer-based nanocomposite thin film with an SPR sensor exhibited a significant increase in sensitivity and binding affinity to a lower range DENV-2 E-protein concentrations. Moreover, the proposed sensor displayed good selectivity towards DENV-2 E-proteins and have an average recovery of 80–120%. The findings of this study demonstrated that PAMAM dendrimer-based nanocomposite thin film combined with SPR sensor is a promising diagnostic tool for sensitive and selective detection of DENV-2 E-proteins.

show abstract

In-situ hydrothermal fabrication and photocatalytic behavior of ZnO/reduced graphene oxide nanocomposites with varying graphene oxide concentrations

Cited by 39 publications

References 43 publications

ON THE CONTRIBUTION FACTORS OF ENHANCED PHOTOCATALYTIC ACTIVITY OF DOPED SEMICONDUCTORS: STRUCTURAL AND OPTICAL INTVESTIGATION OF CU2+ DOPED ZnO NANOPARTICLE

ON THE CONTRIBUTION FACTORS OF ENHANCED PHOTOCATALYTIC ACTIVITY OF DOPED SEMICONDUCTORS: STRUCTURAL AND OPTICAL INTVESTIGATION OF CU2+ DOPED ZnO NANOPARTICLE

Recent Advances in Zinc Oxide Nanostructures with Antimicrobial Activities

An Optical Sensor for Dengue Envelope Proteins Using Polyamidoamine Dendrimer Biopolymer-Based Nanocomposite Thin Film: Enhanced Sensitivity, Selectivity, and Recovery Studies

Contact Info

Product

Resources

About