Selenium nanomaterials: An overview of recent developments in synthesis, properties and potential applications

Chaudhary, Savita; Umar, Ahmad; Mehta, S.K.

doi:10.1016/j.pmatsci.2016.07.001

Cited by 188 publications

(98 citation statements)

References 424 publications

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“…We combine the thermal drawing process with a simple sonochemical nanowire growth mechanism applied to amorphous selenium (Se) domains. Selenium is an excellent optoelectronic material in its trigonal phase and is used in a myriad of applications . As we show experimentally and via first principles density‐functional theory calculations, its trigonal structure exhibits an exacerbated anisotropy in the surface energy of the different crystal planes in the solvent.…”

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confidence: 84%

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Semiconducting Nanowire‐Based Optoelectronic Fibers

et al. 2017

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imaging systems, [3][4][5][6][7] nanophotonics, [8] light generation and communication, [1] energy harvesting, [9][10][11] and advanced textiles. [12,13] To functionalize optical fibers, a first strategy relies on wafer-based techniques [8] and modified deposition [14,15] to integrate functional materials at the tip or within a few tens of centimeters of microstructured silica fibers. An alternative approach exploits the well-established thermal drawing of macroscopic preforms that integrate the desired multimaterial architecture. [1] This has the advantage of simplicity and scalability, since the fiber pulling step results in tens of kilometers of fibers that have the same crosssectional structure as the initial preform. Thus far however, realizing high-quality semiconducting materials that can act as high-performance photodetectors using the thermal drawing process remains a challenge. A recent strategy consists in the thermal drawing within silica fibers of high melting point materials such as silicon, [16] germanium, [17] or various compounds. [18] The melting and solidification during drawing result however in semiconductors with a highly polycrystalline microstructure, requiring local postdrawing annealing or laserbased steps to engineer a desired microstructure. [15,18,19] It is also difficult to integrate electrodes in contact with the semiconducting domains and despite an ingenious and promising method, no device with good optoelectronic properties has been shown. [17] The alternative strategy relies on exploiting the polymer fiber platform. It has several advantages compared to its silica counterpart, including low-temperature processing, robust mechanical properties, simple integration of electrodes, and the ability to impart fibers with complex architectures and multiple functionalities. [1] Thus far however, the postdrawing crystallization schemes applied to semiconducting chalcogenide glasses have resulted in poor control over the phase, grain size, and orientation, impairing device performance. [5,20] A powerful approach to control the microstructure and enhance optoelectronic performance is via the growth of welloriented semiconducting nanowires. This approach has not been exploited in the frame of fiber-integrated devices since conventional fabrication procedures of semiconducting nanowires are complex and only adapted to specific substrates seemingly incompatible with the thermal drawing process and the fiber materials and geometry. [8,21] Here, we demonstrate for the first time the robust and scalable integration of high-qualityThe recent ability to integrate semiconductor-based optoelectronic functionalities within thin fibers is opening intriguing opportunities for flexible electronics and advanced textiles. The scalable integration of high-quality semiconducting devices within functional fibers however remains a challenge. It is difficult with current strategies to combine high light absorption, good microstructure and efficient electrical contact. The growth of semiconducting nanowires is ...

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confidence: 84%

“…Se nanowires have been previously fabricated from amorphous nanoparticle seeds obtained by the reduction of Se‐based compounds via a hydrothermal approach . Here we found that Se nanowires can be synthesized directly from amorphous bulk at room temperature.…”

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confidence: 89%

Semiconducting Nanowire‐Based Optoelectronic Fibers

et al. 2017

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“…9,27 Hydrothermal techniques rely on decomposition of complex Se-based compounds at high temperatures in aqueous solutions via chemical reactions. 10,11,26,28,29 All these techniques require complicated postsynthesis transferring methods for making Se nanowire-based devices. Byproducts formed during chemical reactions might also contaminate the nanowires, thereby affecting their practical applications.…”

Section: ■ Introductionmentioning

confidence: 99%

Direct Synthesis of Selenium Nanowire Mesh on a Solid Substrate and Insights into Ultrafast Photocarrier Dynamics

et al. 2018

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Selenium (Se) nanowires have generated much interest both for the fundamental understanding of crystal formation and growth and for technological applications in optoelectronics, imaging, piezoelectricity, catalysis, and energy harvesting and storage. Several methods have been established to synthesize Se nanowires, but they require sophisticated fabrication steps, are energy intensive, and may involve complex chemical reactions. Moreover, despite an increasing interest, little is known regarding photocarrier dynamics of Se nanowires. Here, we investigate a solution-based approach for the facile synthesis of single-crystal Se nanowires over the large scale where nanowires are directly grown from an amorphous bulk in a solution at room temperature without any chemical reaction. We study the nanowire nucleation and growth mechanism via electron microscopy. We also investigate, for the first time, the charge carrier dynamics and mobility of Se nanowire meshes by means of ultrafast transient absorption spectroscopy, nanosecond flash photolysis, and time-resolved terahertz spectroscopy. These contact-free and noninvasive approaches reveal a lifetime on the picosecond scale for free carriers and on the microsecond scale for trapped carriers, both of which are limited by trap-assisted recombination and a free carrier mobility of ∼3.0 cm 2 V −1 s −1. Our work for the first time reveals the rationale behind the excellent properties of some Se NW-based optoelectronic devices. It also highlights the simplicity and robustness of the novel Se nanowire synthesis scheme and paves the way toward the simple fabrication of advanced nanowire-based electronic and optoelectronic nanodevices.

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“…insoluble form by microorganisms in ruminant's body, and its process decreases the selenium absorption in the digestive gastrointestinal cavity [25]. Selenium occurs in multiple oxidation states, for example, +6, +4, 0, or −2 [12]. Oxyanions of selenium, that is selenite and selenate, are biologically available [25].…”

Section: Kumar and Prasadmentioning

confidence: 99%

“…During the biogenic synthesis of NPs, the microorganisms interact with target ions from their environment and then turn the metal ions into the elemental metal through enzymes generated by the microbial cell activities [9]. NPs show the size-and shape-dependent characteristics which are of great interest in applications such as biosensing and catalysts to optics, antimicrobial activity [5], anticancer activity [10], antioxidant activity [11], environmental treatment, solar cells, computer transistors, electrometers, chemical sensors, and wireless electronic logic and memory schemes [12]. Selenium is used widely for the fabrication of pigments [13].…”

Section: Introductionmentioning

confidence: 99%

Biogenic Selenium Nanoparticles for Their Therapeutic Application

Kumar

Prasad

2019

Asian J Pharm Clin Res

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Biosynthesis is an eloquent, safe, biocompatible, eco-friendly, and recyclable way of preparing selenium nanoparticles (SeNPs). Selenium occurs in multiple oxidation states, for example, +6, +4, 0, or −2. Selenium (Se) is an essential trace element with a very narrow margin between the lowest acceptable levels of intake and toxicity. Selenium is an essential trace element required for all living organisms. Despite its essentiality, selenium is a potentially toxic element to natural ecosystems due to its bioaccumulation potential that is why it is biologically available in the environment. Selenium is a trace element commonly found in materials of the earth’s crust, and it is essential for humans, animals, and plants. Oxyanions of selenium, that is selenite and selenate, are biologically available. Selenium in the form of selenate ion (SeO42−) is more toxic to most organisms than selenite (SeO32−). Contrarily, elemental selenium (Se0) is inOsoluble and less toxic in comparison to other forms of selenium. Nanoselenium (Se0) in the range of 100–500 nm has similar bioavailability to other forms of selenium into plants, animals, humans, and microorganisms. Biologically synthesized SeNP has many biological applications in the field of medical and pharmaceutical research to combat threats to human health. Biogenic SeNPs have anticancer (cytotoxic) activity, antioxidant activity, and antimicrobial activity. Researches are going on with special interest of SeNPs. Conjugation of antibiotics with SeNPs enhances their anticancer efficacy. SeNPs have also applications in nanobiosensors and environmental remediation.

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Selenium nanomaterials: An overview of recent developments in synthesis, properties and potential applications

Cited by 188 publications

References 424 publications

Semiconducting Nanowire‐Based Optoelectronic Fibers

Semiconducting Nanowire‐Based Optoelectronic Fibers

Direct Synthesis of Selenium Nanowire Mesh on a Solid Substrate and Insights into Ultrafast Photocarrier Dynamics

Biogenic Selenium Nanoparticles for Their Therapeutic Application

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