Ultrafast optical nonlinearity in nanostructured selenium allotropes

Mary, K.A. Ann; Unnikrishnan, N.V.; Philip, Reji

doi:10.1016/j.cplett.2013.09.069

Cited by 22 publications

(8 citation statements)

References 26 publications

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“… 55 The semimetallic nature of the material and structural similarities with the bulk cause broadening of these individual peaks. 56 The optical band gap of t-Se QDs is 1.64 eV as calculated from a Tauc plot (inset of Figure 6 a). According to values reported in the literature, trigonal selenium exhibits a band gap energy value of 2 eV.…”

Section: Resultsmentioning

confidence: 96%

Solid-State Fluorescent Selenium Quantum Dots by a Solvothermal-Assisted Sol–Gel Route for Curcumin Sensing

2021

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Toward the need for solid-state fluorescent quantum dots, resistant to self-quenching, we describe a solvothermal-assisted sol–gel method to synthesize Se quantum dots. Morphological and crystalline characterizations reveal that Se quantum dots (average size 3–8 nm) have a trigonal crystal structure. The presence of planar defects (dislocations, stacking faults, twins, and grain boundaries) suggests formation of Se nanocrystallites through aggregation-based crystal growth mechanisms. Under ultraviolet excitation, the quantum dots exhibit an excitation wavelength-dependent solid-state blue emission with an average lifetime of 1.96 ns. Depending on fluorescence quenching by curcumin, selenium quantum dots act as ideal candidates for inner filter effect-based curcumin sensing.

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Section: Resultsmentioning

confidence: 96%

Solid-State Fluorescent Selenium Quantum Dots by a Solvothermal-Assisted Sol–Gel Route for Curcumin Sensing

2021

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“…The film was sandwiched between two stainless disc electrodes of a sample holder and was connected to the impedance spectrometer for data acquisition to examine their dielectric properties. The information regarding crystallinity, purity and TEM images have been reported in one of our earlier communications …”

Section: Methodsmentioning

confidence: 96%

“…Usually, silica‐capped nanoparticles are prepared through Stober method and reverse micoemulsion method which involves multiple complicated steps. The silica‐capped Ag 2 S, CuS, Ag 2 S/CuS alloy, and Ag 2 S/CuS nanocomposite particles were synthesized through a sol–gel process with tetraethyl orthosilicate (TEOS) as precursors in the presence of ethanol . The dopants were added in the form of copper acetate and copper nitrate, silver nitrate, and thioacetamide as copper, silver, and sulfur sources, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Owing to the size and composition tunable optical and electrical properties, considerable research on semiconductor–semiconductor alloy/nanocomposite systems is evolving for realization in high photocatalytic activity, efficient solar energy conversion and nonlinear optics . Recently, we have reported the synthesis of Ag 2 S/CuS alloy/nanocomposite systems with their nonlinear optical properties being improved by the relative amount of Ag 2 S in the nanomaterial …”

Section: Introductionmentioning

confidence: 99%

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Freestanding Ag₂S/CuS PVA films with improved dielectric properties for organic electronics

Aippunny

Shamsudeen

Valparambil

et al. 2016

J of Applied Polymer Sci

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The prime goal of this work is to synthesize free‐standing polyvinyl alcohol (PVA) films doped with Ag2S, CuS, Ag2S/CuS alloy, and Ag2S/CuS nanocomposites through the sol–gel route. The dependence of Ag2S content in the PVA nanocomposite films on both the real and imaginary parts of the complex permittivity and loss tangent values was examined. An enhanced dielectric constant was achieved with minimum dielectric loss due to the insulating silica layer. By changing the Ag2S content in Ag2S/CuS PVA films, the AC conductivity is improved with pure Ag2S nanoparticles exhibiting highest values of the order of 10−6−10−9 S/cm. The Cole–Cole parameters were calculated and the semicircles observed in the plots indicate a single relaxation process. The results suggest that these composite films are potential materials for embedded capacitor applications. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43568.

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“…Moreover, the segregation of Se and Te atoms through the silver or gold layers is one of the most promising alternatives for fabricating 2D selenium (selenene) and tellurium (tellurene) in a similar way that germanene and silicene were fabricated by Kurosawa et al [29]. This is important due to unusual optical effects in such structures, particularly in the case of selenium [34–35].…”

Section: Introductionmentioning

confidence: 99%

Interaction of Te and Se interlayers with Ag or Au nanofilms in sandwich structures

Ciesielski

Skowroński

Trzciński

et al. 2019

Beilstein J. Nanotechnol.

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Noble metal nanolayers on flat substrates are often deposited with the use of semiconductor interlayers, which may strongly interact with the noble metal overlayer. We investigated the crystallinity, atomic concentration profile and optical parameters of ≈35 nm-thick silver and gold layers deposited on glass substrates with 2 nm-thick tellurium or selenium interlayers. Our study, based on X-ray reflectometry (XRR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and ellipsometric measurements, showed that using either of these interlayers introduces strain in nanocrystals of both plasmonic films. This, in turn, influences the migration of Se and Te into the metal layers. Selenium atoms migrate both in the silver and gold nanolayers, while tellurium atoms migrate only in silver. The Te concentration curve clearly suggests that this migration is an effect of the segregation of Te atoms in the silver structure. The differences in crystallinity, as well as the migration process, strongly influence the optical parameters of Ag and Au. In the permittivity of Ag deposited on either Te or Se, additional plasmonic bands originating from grain boundary segregation or diffusion occur, while for the Au layer, such resonances were not pronounced. In the permittivity of both materials, the intensity of the interband transition peaks is strongly altered, possibly due to the nano-alloy formation, but more likely due to the microstrain on metal grains.

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Ultrafast optical nonlinearity in nanostructured selenium allotropes

Cited by 22 publications

References 26 publications

Solid-State Fluorescent Selenium Quantum Dots by a Solvothermal-Assisted Sol–Gel Route for Curcumin Sensing

Solid-State Fluorescent Selenium Quantum Dots by a Solvothermal-Assisted Sol–Gel Route for Curcumin Sensing

Freestanding Ag₂S/CuS PVA films with improved dielectric properties for organic electronics

Interaction of Te and Se interlayers with Ag or Au nanofilms in sandwich structures

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Ultrafast optical nonlinearity in nanostructured selenium allotropes

Cited by 22 publications

References 26 publications

Solid-State Fluorescent Selenium Quantum Dots by a Solvothermal-Assisted Sol–Gel Route for Curcumin Sensing

Solid-State Fluorescent Selenium Quantum Dots by a Solvothermal-Assisted Sol–Gel Route for Curcumin Sensing

Freestanding Ag2S/CuS PVA films with improved dielectric properties for organic electronics

Interaction of Te and Se interlayers with Ag or Au nanofilms in sandwich structures

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Product

Resources

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Freestanding Ag₂S/CuS PVA films with improved dielectric properties for organic electronics