Konjac glucomannan-templated synthesis of three-dimensional NiO nanostructures assembled from porous NiO nanoplates for gas sensors

Sơn, Lê Lâm; Cuong, Nguyen Duc; Thi, Tran Thi Van; Hiếu, Lê Trung; Trung, Do Dang; Hieu, Nguyen Van

doi:10.1039/c9ra00285e

Cited by 22 publications

(6 citation statements)

References 56 publications

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“…After the calcination process, the feature absorption bands of NiC 2 O 4 -based samples disappeared in FTIR spectra of calcined samples (electronic supplementary material, figure S6(c,d)). For 0–5%Co-NiO samples (electronic supplementary material, figure S6(c)), the strong band at about 416 cm −1 was assignable to the stretching vibration of Ni–O [ 40 ]. The broad absorption band centred at 3400 cm −1 and the band at approximately 1627 cm −1 were indexed to O–H and H–O–H bending vibration modes [ 41 ].…”

Section: Resultsmentioning

confidence: 99%

Highly porous Co-doped NiO nanorods: facile hydrothermal synthesis and electrocatalytic oxygen evolution properties

et al. 2021

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Highly porous 3d transition metal oxide nanostructures are opening up the exciting area of oxygen evolution reaction (OER) catalysts in alkaline medium thanks to their good thermal and chemical stability, excellent physiochemical properties, high specific surface area and abundant nanopores. In this paper, highly porous Co-doped NiO nanorods were successfully synthesized by a simple hydrothermal method. The porous rod-like nanostructures were preserved with the added cobalt dopant ranging from 1 to 5 at% but were broken into aggregated nanoparticles at higher concentrations of additional cobalt. The catalytic activity of Co-doped NiO nanostructures for OER in an alkaline medium was assayed. The 5%Co-NiO sample showed a drastically enhanced activity. This result could originate from the combination of advantageous characteristics of highly porous NiO nanorods such as large surface area and high porosity as well as the important role of Co dopant that could provide more catalytic active sites, leading to an enhanced catalytic activity of the nanocatalyst.

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Section: Resultsmentioning

confidence: 99%

Highly porous Co-doped NiO nanorods: facile hydrothermal synthesis and electrocatalytic oxygen evolution properties

et al. 2021

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“…Niken oxit (NiO) là vật liệu bán dẫn loại p với bề rộng vùng cấm lớn ~3.6 -4.0 eV. NiO là một vật liệu hứa hẹn trong nhiều lĩnh vực nghiên cứu khác nhau vì những ưu điểm vượt trội của nó như trong cảm biến khí [1][2][3], vật liệu quang xúc tác cho phản ứng phân hủy các thuốc nhuộm công nghiệp [4][5][6], chế tạo pin năng lượng mặt trời [7], chất phủ điện sắc [8,9], diệt khuẩn [10][11][12]… Graphen (Gr) là một dạng hợp chất cấu tạo từ đơn lớp các nguyên tử Carbon, đã được nghiên cứu rất nhiều do các tính chất nổi bật như diện tích bề mặt ISSN: 2734-9381 https://doi.org/10.51316/jst.149.etsd.2021.31.2.20 Received: August 30, 2020; accepted: December 23, 2020 lớn [13], độ linh động điện tử vượt trội [14], dẫn nhiệt tốt và độ bền cao. Tuy nhiên, do hiệu ứng biên, khả năng phân tán thấp và khả năng dễ bị tái xếp lớp nên ứng dụng của Gr còn bị hạn chế.…”

Section: Giới Thiệu *unclassified

In-situ Synthesis rGO/NiO Nanorod Nanocomposites Via One-Step Hydrothermal Method and Investigating Physical Properties of Nanocomposites

2021

JST: ETSD

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In-situ nanocomposites of reduced graphene oxide (rGO) and niken oxide (NiO) nanowire were prepared by direct introducing homemade graphene oxide (GO) into precursor solution of NiO with different weight contents of GO (0.0, 0.5, and 1.0 wt.%) before carrying out the one-step hydrothermal process. Homemade GO was synthesized from graphene nanoflakes via Hummer method. Crystal structure and crystallinity of nanocomposites were analyzed using X-ray diffraction method. Scanning electron microscopy was used to study the morphology of nanocomposites. The absorbability of nanocomposites was evaluated through the absorption experiment with two organic dyes: methyl orange and congo red. The results show that compositing with GO does not affect the crystal structure of NiO but it causes the break of NiO nanorod into shorter nanorods, the increase of microstrain in NiO nanorods, and the increase of the absorption efficiency of nanocomposite with both methyl orange and congo red. The results are contribution to the study on hybrid/nanocomposite materials of carbon-based materials and metal oxide semiconductor nanostructures.

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“…Biomolecule templating is a biomimetic route for constructing porous nanomaterials as biopolymer templates can transfer hierarchical features into solids. [95] Some attempts have designed various porous oxide nanoarchitectures from mimicking peptide bundle templates. Kim et al [96] performed atomic layer deposition of titanium precursors on peptide nanonetworks for a highly ordered nanonetwork structure.…”

Section: Self-assembled Integrationmentioning

confidence: 99%

“…The porous structures enable rapid gas diffusion inside sensing materials and their high surface areas increase adsorption sites, which result in fast gas response. [95] The incorporation of functional additives such as metal-based nanoclusters into supports can afford active composite gas sensors. The enhanced sensor response results from defect structures by doping additives, gas reactions accelerated by additives, or tunable surface band in a heterostructure.…”

Section: Semiconductor Gas Nanosensorsmentioning

confidence: 99%

Progress through synergistic effects of heterojunction in nanocatalysts ‐ Review

Cuong

Quang

2020

Vietnam Journal of Chemistry

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There are major advances in the development of the nanostructured materials to enhance the reaction performance in catalytic field. Recent efforts have shown that high conversion efficiency and stability of efficient nanocatalysts can be achieved by combining the intrinsic properties of single components into heterostructures. The unprecedented combination affords the integrated nanocatalysts capable of overcoming the limitations of single components and addressing the issues of the assessment of the efficiency of the catalytic converters. The present review gives a concise overview of the heterostructured nanoarchitectures with a focus of the tailoring of their structural geometry, self‐construction and surface chemistry to effectively create integrated catalysts with multi‐functionalities. The novel integrated catalysts present in the critical review were emphasized these concepts by undergoing inherent synergistic effects in their heterojunction structures to emerge superior catalytic performance and high selectivity for promising applications. Various types of the integrated nanocatalysts including coupled particles, porous composites, organized hybrids, assembled films, and biomimetic replicas are presented in respect to the discussion of expressive statements for widespread emerging applications in artificial photosynthesis, graphene‐based catalysts, electrochemical gas sensing, water‐gas shift reaction, and methane fuel generation.

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Konjac glucomannan-templated synthesis of three-dimensional NiO nanostructures assembled from porous NiO nanoplates for gas sensors

Abstract: Biopolymer template synthesis has attracted extensive interest for fabricating highly porous metal oxide nanostructures.

Cited by 22 publications

References 56 publications

Highly porous Co-doped NiO nanorods: facile hydrothermal synthesis and electrocatalytic oxygen evolution properties

Highly porous Co-doped NiO nanorods: facile hydrothermal synthesis and electrocatalytic oxygen evolution properties

In-situ Synthesis rGO/NiO Nanorod Nanocomposites Via One-Step Hydrothermal Method and Investigating Physical Properties of Nanocomposites

Progress through synergistic effects of heterojunction in nanocatalysts ‐ Review

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