A facile synthesis of 1D nano structured selenium and Au decorated nano selenium: catalysts for the clock reaction

Ray, Chaiti; Dutta, Soumen; Sarkar, Sougata; Sahoo, Ramkrishna; Roy, Anindita; Pal, Tarasankar

doi:10.1039/c3ra44102d

Cited by 46 publications

(37 citation statements)

References 62 publications

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“…The chemical stability of the as‐prepared 2D Se nanosheets was investigated by X‐ray photoelectron spectroscopy (XPS) (Figure c) and UV–vis absorption spectroscopy (Figure d). The as‐prepared 2D Se nanosheets exhibited a peak at 54 eV analogous to bulk Se, as represented in Figure c, which arises from the SeSe bonds (i.e., zero‐valent crystalline Se) . The absence of a signal at 59 eV indicates that the 2D Se nanosheets were not oxidized during the exfoliation process .…”

Section: Resultsmentioning

confidence: 99%

2D Nonlayered Selenium Nanosheets: Facile Synthesis, Photoluminescence, and Ultrafast Photonics

Xing

Xie

Liang

et al. 2017

Advanced Optical Materials

181

112

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nearly 100%) with low-dimensional effect, thus having specific physical features that offer a wealth of potential to both scientific and industrial communities. [1][2][3][4][5] Extensive investigations have demonstrated that layered materials are the most common precursors to produce 2D nanostructures because these materials are constructed from stacked layers wherein weak van der Waals interactions hold together each interplane layer and strong chemical covalent bonding governs each individual in-plane layer. [5][6][7] Interestingly, 2D nanoplates can be readily prepared through two main well-established strategies, namely, the "top-down method" (mechanical cleavage, liquid-phase exfoliation, etc.) [1,[7][8][9][10][11] and the "bottom-up method" (e.g., chemical vapor deposition and wet-chemical methods). [12][13][14][15][16] Among these methods, liquid-phase exfoliation is considered to be quite promising and powerful due to its high output, large scalability, low cost, and simplicity. [7] Moreover, this method can produce nanosheets from most layered materials provided that the solvent's surface energy matches well with that of the target nanosheets. [7,17] The limited species and quantity, as well as the lack of certain properties, of 2D layered materials have motivated extensive investigations into 2D nonlayered materials, whose bulk counterparts are nonlayered and are held together strongly by chemical bonds in all three dimensions. [5,[18][19][20][21][22][23] In comparison with 2D layered materials, 2D nonlayered materials show distinct characteristics that their layered counterparts may not possess. Specifically, the surfaces of 2D nonlayered materials have abundant dangling bonds, which are absent on the surface of the layered materials, thereby offering numerous chemically active sites and resulting in improved catalytic capacity, [24][25][26] energy storage and conversion, [27,28] carrier properties, [18,29] etc. Due to these merits, considerable efforts have been made to fabricate 2D nonlayered materials. He and co-workers demonstrated a van der Waals epitaxial method to fabricate 2D nonlayered Pb 1−x Sn x Se nanoplates. [30,31] Zhang and co-workers synthesized nanosheets from the noble metal gold via a template-directed synthesis in which graphene oxide was developed as a 2D template for the growth of nonlayered materials. [32][33][34] Inspired by the concept of 2D layered materials, Sun and co-workers reported freestanding ZnSe single Investigations into 2D nanomaterials are of considerable significance from both an academic and industrial point of view. The present work addresses, for the first time, the fabrication of 2D nonlayered ultrathin selenium through a facile liquid-phase exfoliation method. The results reveal that the asprepared 2D Se nanosheets are 40-120 nm in lateral dimension and 3-6 nm in thickness. The nanosheets exhibit a trigonal crystalline phase similar to their bulk counterpart, indicating the conservation of the crystalline features during the exfoliation procedure. The success...

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Section: Resultsmentioning

confidence: 99%

2D Nonlayered Selenium Nanosheets: Facile Synthesis, Photoluminescence, and Ultrafast Photonics

Xing

Xie

Liang

et al. 2017

Advanced Optical Materials

181

112

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“…The explanation of this finding is the sublimation of the elemental nanoscale Se at this temperature. 29…”

Section: Resultsmentioning

confidence: 99%

High-Temperature Stress Alleviation by Selenium Nanoparticle Treatment in Grain Sorghum

Djanaguiraman

Belliraj

Bossmann³

et al. 2018

ACS Omega

206

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The role of selenium nanoparticles (Se-NPs) in the mitigation of high-temperature (HT) stress in crops is not known. The uptake, toxicity and physiological and biological effects of Se-NPs under HT were investigated in grain sorghum [ Sorghum bicolor (L.) Moench]. Se-NPs of size 10–40 nm were synthesized and characterized to indicate nanocrystalline structure. A toxicity assay showed that Se-NPs concentration inducing 50% cell mortality (TC50) was 275 mg L –1 . Translocation study indicated that Se-NPs can move from root to shoot of sorghum plants. Foliar spray of 10 mg L –1 Se-NPs during the booting stage of sorghum grown under HT stress stimulated the antioxidant defense system by enhancing antioxidant enzymes activity. Furthermore, it decreased the concentration of signature oxidants. Se-NPs facilitated higher levels of unsaturated phospholipids. Se-NPs under HT stress improved the pollen germination percentage, leading to a significantly increased seed yield. The increased antioxidant enzyme activity and decreased content of oxidants in the presence of Se-NPs were greater under HT (38/28 °C) than under optimum temperature conditions (32/22 °C). In conclusion, Se-NPs can protect sorghum plants by enhanced antioxidative defense system under HT stress.

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“…Importantly, the noble metal Au NRs boost the reactivity of Cu 2 O in the composite, which may increase the rate of reaction and lead to the adsorption of MB dye reaching equilibrium within 20 min. 39 , 40 …”

Section: Results and Discussionmentioning

confidence: 99%

Well-Designed Au Nanorod-Doped Cu₂O Core–Shell Nanocube-Embedded Reduced Graphene Oxide Composite for Efficient Removal of a Water Pollutant Dye

et al. 2020

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To ensure environmental safety, the removal of organic pollutants has gained increasing attention globally. We have synthesized uniform Au nanorod (NR)-doped Cu 2 O core–shell nanocubes (CSNCs) via a seed-mediated route embedded on the surface of rGO sheets. The Au NRs@Cu 2 O/rGO nanocomposite was characterized using various techniques such as transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier-transform infrared (FT-IR) and Raman spectroscopies. The scanning TEM-energy-dispersive spectroscopy (STEM-EDS) elemental mapping of the AuNRs@Cu 2 O/rGO nanocomposite indicates that the Au NR (40 nm) is fully covered with the Cu 2 O particles (∼145 nm) as a shell. N 2 gas sorption analysis shows that the specific surface area of the composite is 205.5 m 2 /g with a mesoporous character. Moreover, incorporation of Au NRs@Cu 2 O CSNCs increases the nanogaps around the nanoparticles and suppresses the stacking/bundling of rGO, which significantly influences the pore size and increase the surface area. A batch adsorption experiment was carried out under various parameters, such as the effect of pH, contact time, temperature, initial dye concentration, and adsorbent dosage, for the removal of methylene blue (MB) in aqueous solution. The high surface area and mesoporosity can cause the adsorption capacity to reach equilibrium within 20 min with a 99.8% removal efficiency. Both kinetic and isotherm data were obtained and fitted very well with the pseudo-second-order kinetic and Langmuir isotherm model. The Langmuir isotherm revealed an excellent dye sorption capacity of 243.9 mg/g at 298 K. Moreover, after five adsorption cycles, the dye removal efficiency decreased from 99 to 86%. This novel route paves a new path for heterogeneous adsorbent synthesis, which is useful for catalysis and electrochemical applications.

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A facile synthesis of 1D nano structured selenium and Au decorated nano selenium: catalysts for the clock reaction

Cited by 46 publications

References 62 publications

2D Nonlayered Selenium Nanosheets: Facile Synthesis, Photoluminescence, and Ultrafast Photonics

2D Nonlayered Selenium Nanosheets: Facile Synthesis, Photoluminescence, and Ultrafast Photonics

High-Temperature Stress Alleviation by Selenium Nanoparticle Treatment in Grain Sorghum

Well-Designed Au Nanorod-Doped Cu₂O Core–Shell Nanocube-Embedded Reduced Graphene Oxide Composite for Efficient Removal of a Water Pollutant Dye

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A facile synthesis of 1D nano structured selenium and Au decorated nano selenium: catalysts for the clock reaction

Cited by 46 publications

References 62 publications

2D Nonlayered Selenium Nanosheets: Facile Synthesis, Photoluminescence, and Ultrafast Photonics

2D Nonlayered Selenium Nanosheets: Facile Synthesis, Photoluminescence, and Ultrafast Photonics

High-Temperature Stress Alleviation by Selenium Nanoparticle Treatment in Grain Sorghum

Well-Designed Au Nanorod-Doped Cu2O Core–Shell Nanocube-Embedded Reduced Graphene Oxide Composite for Efficient Removal of a Water Pollutant Dye

Contact Info

Product

Resources

About

Well-Designed Au Nanorod-Doped Cu₂O Core–Shell Nanocube-Embedded Reduced Graphene Oxide Composite for Efficient Removal of a Water Pollutant Dye