Influence of precursor molar concentration on the electrical and magnetic properties of synthesized MnS nanocrystals

Veeramanikandasamy, T.; Rajendran, K.; Sambath, K.; Balamurugan, A.

doi:10.1007/s10854-016-4775-z

Cited by 5 publications

(1 citation statement)

References 19 publications

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“…The data in Table 1 above showed that optical nonlinearity of graphene-MnS was better than combination of two separate components at high incident intensity. In an external electric field, the light-induced effective local electric field redistribution created an additional synergistic effect on NCs surface between γMnS and graphene layers, which could theoretically address the local field effect through the Maxwell Garnet model [28][29][30][31]. The model assumed that spherical particles, which had a diameter smaller than the wavelength of incident light, were encapsulated in a continuous host medium.…”

Section: Nlo Property Of Ncsmentioning

confidence: 99%

Facile One-Step Synthesis and Enhanced Optical Nonlinearity of Graphene-γMnS

Zhang

et al. 2019

Nanomaterials

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Graphene-γMnS were prepared by facile one-step hydrothermal method. Structures and properties of samples were explored by characterization, and nonlinear optical (NLO) enhancement of nanocomposites (NCs) was fully studied. Nanoparticles and NCs were tested at 532 nm by a Z-scan technique. With γMnS attached in G layers, NLO susceptibility of graphene-γMnS was greatly improved under single-pulse laser irradiation compared with G and γMnS. The nonlinearity enhanced was attributed to local field effect and charge transfer between γMnS and graphene layers. And NLO property enhancement was restricted by non-radiative defects in graphene-γMnS. Exploring the mechanism of nonlinearity enhancement was significant for fabrication of NLO devices. However, the optical nonlinearity decreased first and then increased with further increased addition of GO, because the dispersion of γMnS attached on graphene surface might make density of sp 2 fragment and defects changed. Graphene-γMnS exhibited excellent and tunable NLO performance, illustrating that NCs materials have potential applications in NLO devices. Nanomaterials 2019, 9, 1654 2 of 16 and graphene [12][13][14]. However, there are few reports about NLO performance of graphene-γMnS. In fact, we have previously studied αMnS/rGO without thoroughly investigating the nonlinearity of graphene-γMnS and the mechanism of NLO performance enhanced of NCs [15]. It is necessary to explore NLO responses of graphene-γMnS and its mechanism of enhanced nonlinearity.In this study, graphene-γMnS was synthesized by facile one-step hydrothermal method, and mechanism of NLO enhancement was discussed. Nonlinearity of NCs was controlled by changing amount of GO added, and samples were tested at 532 nm by picosecond (PS) laser pulse. We want to explore whether graphene-γMnS had potential applications in optical communication, optical limiter, and all-optical switch. Experiments Synthesis of Graphene Oxide ( GO) and Graphene-γMnSGO was prepared by improved Hummer method [16]. Firstly, graphite powder was oxidized to GO by KMnO 4 and 98% H 2 SO 4 . Then, a solution was mixed with H 2 O 2 and the mixture was washed several times with deionized water to remove impurities. Finally, products were dried at 45 • C for 48 h in vacuum drying oven. Improved Hammer method increased generation efficiency and oxidation degree of GO. Furthermore, this method could effectively prevent generation of toxic gases which caused harm to human body. High efficiency, high quality, and no toxicity in GO synthesis were important for large-scale production of GO.Graphene-γMnS was prepared by facile one-step hydrothermal method. The synthesis process of NCs was shown in Figure 1. Firstly, GO was dispersed in ethylene glycol. Secondly, TAA and MnCl 2 ·4H 2 O were added to GO suspension. After half-an-hour stirring, the solution was transferred to Teflon-lined stainless-steel autoclave and reacted at 170 • C for 6 h. The reaction temperature in our previous study was 190 • C and product was different [15]. Then, products wer...

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Section: Nlo Property Of Ncsmentioning

confidence: 99%