Large-area growth of multi-layer hexagonal boron nitride on polished cobalt foils by plasma-assisted molecular beam epitaxy

Xu, Zhenbang; Tian, Hao; Khanaki, Alireza; Zheng, Renjing; Suja, Mohammad; Liu, Jianlin

doi:10.1038/srep43100

Cited by 49 publications

(41 citation statements)

References 43 publications

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“…C1s peak occurs at 284.6 eV indicating the existence of C sp 2 bonding of G layers [37,38]. B1s and N1s exhibit energy positions at 190.4 eV and 397.7 eV, respectively, which is consistent with the reported values for XPS signals of h-BN [39,40]. By using sensitivity factors from the instrument manufacturer and calculating the atomic % of each atom, the B/N ratio is 1.03, suggesting an almost equal composition of B and N elements.…”

Section: Resultssupporting

confidence: 89%

Effect of high carbon incorporation in Co substrates on the epitaxy of hexagonal boron nitride/graphene heterostructures

Khanaki

Tian

et al. 2017

Nanotechnology

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We carried out a systematic study of hexagonal boron nitride/graphene (h-BN/G) heterostructure growth by introducing high incorporation of a carbon (C) source on a heated cobalt (Co) foil substrate followed by boron and nitrogen sources in a molecular beam epitaxy system. With the increase of C incorporation in Co, three distinct regions of h-BN/G heterostructures were observed from region (1) where the C saturation was not attained at the growth temperature (900 °C) and G was grown only by precipitation during the cooling process to form a 'G network' underneath the h-BN film; to region (2) where the Co substrate was just saturated by C atoms at the growth temperature and a part of G growth occurs isothermally to form G islands and another part by precipitation, resulting in a non-uniform h-BN/G film; and to region (3) where a continuous layered G structure was formed at the growth temperature and precipitated C atoms added additional G layers to the system, leading to a uniform h-BN/G film. It is also found that in all three h-BN/G heterostructure growth regions, a 3 h h-BN growth at 900 °C led to h-BN film with a thickness of 1-2 nm, regardless of the underneath G layers' thickness or morphology. Growth time and growth temperature effects have been also studied.

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Section: Resultssupporting

confidence: 89%

Effect of high carbon incorporation in Co substrates on the epitaxy of hexagonal boron nitride/graphene heterostructures

Khanaki

Tian

et al. 2017

Nanotechnology

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“…Coverages cannot be determined quantitatively from the intensities of the Raman modes, since these depend on the sample positions, which we assign to a correlation with the local roughness due to structural defects of the surface. Note that we systematically did not observe the characteristic Raman line of hBN at approximately 1,370 cm −1 that was observed for hBN on SiO 2 /Si [61], on Cu foils [62], and on other metal foils [63,64] for our samples of hBN/Cu(111). This is an obvious discrepancy, which we cannot explain based on our current data.…”

Section: The Role Of Surface Defects For Sersmentioning

confidence: 50%

The influence of an interfacial hBN layer on the fluorescence of an organic molecule

Brülke¹,

Bauer²,

Sokołowski³

2020

Beilstein J. Nanotechnol.

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We investigated the ability of a single layer of hexagonal boron nitride (hBN) to decouple the excited state of the organic molecule 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) from the supporting Cu(111) surface by Raman and fluorescence (FL) spectroscopy. The Raman fingerprint-type spectrum of PTCDA served as a monitor for the presence of molecules on the surface. Several broad and weak FL lines between 18,150 and 18,450 cm−1 can be detected, already from the first monolayer onward. In contrast, FL from PTCDA on a bare Cu(111) surface is present only from the second PTCDA layer onward. Hence, a single layer of hBN decouples PTCDA from the metal substrate to an extent that a weak radiative FL decay of the optical excitation can occur. The different FL lines can be ascribed to different environments of the adsorption sites, namely molecules adsorbed at surface defects, in large ordered domains, and located in the second layer.

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“…The most important was to assess the shape and thickness of h-BN flakes before and after the exfoliation process. The commercial h-BN flakes were very thick (~300 nm) [ 27 , 28 ], which corresponded to 900 layers in the individual flake. A large number of flakes was aggregated and connected to each other.…”

Section: Resultsmentioning

confidence: 99%

Hexagonal Boron Nitride Functionalized with Au Nanoparticles—Properties and Potential Biological Applications

et al. 2018

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Hexagonal boron nitride is often referred to as white graphene. This is a 2D layered material, with a structure similar to graphene. It has gained many applications in cosmetics, dental cements, ceramics etc. Hexagonal boron nitride is also used in medicine, as a drug carrier similar as graphene or graphene oxide. Here we report that this material can be exfoliated in two steps: chemical treatment (via modified Hummers method) followed by the sonication treatment. Afterwards, the surface of the obtained material can be efficiently functionalized with gold nanoparticles. The mitochondrial activity was not affected in L929 and MCF-7 cell line cultures during 24-h incubation, whereas longer incubation (for 48, and 72 h) with this nanocomposite affected the cellular metabolism. Lysosome functionality, analyzed using the NR uptake assay, was also reduced in both cell lines. Interestingly, the rate of MCF-7 cell proliferation was reduced when exposed to h-BN loaded with gold nanoparticles. It is believed that h-BN nanocomposite with gold nanoparticles is an attractive material for cancer drug delivery and photodynamic therapy in cancer killing.

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Large-area growth of multi-layer hexagonal boron nitride on polished cobalt foils by plasma-assisted molecular beam epitaxy

Cited by 49 publications

References 43 publications

Effect of high carbon incorporation in Co substrates on the epitaxy of hexagonal boron nitride/graphene heterostructures

Effect of high carbon incorporation in Co substrates on the epitaxy of hexagonal boron nitride/graphene heterostructures

The influence of an interfacial hBN layer on the fluorescence of an organic molecule

Hexagonal Boron Nitride Functionalized with Au Nanoparticles—Properties and Potential Biological Applications

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