Hexagonal boron nitride monolayers on metal supports: Versatile templates for atoms, molecules and nanostructures

Auwärter, Willi

doi:10.1016/j.surfrep.2018.10.001

Cited by 212 publications

(200 citation statements)

References 882 publications

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“…The chemical reactivity of the phenanthridinium precursors 1 on h-BN layers is strikingly similar to what was observed on the noble metals. h-BN is a chemically inert insulator that can be grown as a monolayer on Cu(111) [45][46][47] . Deposition of 1 onto a h-BN/Cu(111) substrate held at 500 K similarly resulted in head-to-tail coupling of the precursor molecules and formation of chains as shown in the STM images in Fig.…”

Section: Resultsmentioning

confidence: 99%

Polycyclic aromatic chains on metals and insulating layers by repetitive [3+2] cycloadditions

et al. 2020

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The vast potential of organic materials for electronic, optoelectronic and spintronic devices entails substantial interest in the fabrication of π-conjugated systems with tailored functionality directly at insulating interfaces. On-surface fabrication of such materials on nonmetal surfaces remains to be demonstrated with high yield and selectivity. Here we present the synthesis of polyaromatic chains on metallic substrates, insulating layers, and in the solid state. Scanning probe microscopy shows the formation of azaullazine repeating units on Au(111), Ag(111), and h-BN/Cu(111), stemming from intermolecular homo-coupling via cycloaddition reactions of CN-substituted polycyclic aromatic azomethine ylide (PAMY) intermediates followed by subsequent dehydrogenation. Matrix-assisted laser desorption/ ionization (MALDI) mass spectrometry demonstrates that the reaction also takes place in the solid state in the absence of any catalyst. Such intermolecular cycloaddition reactions are promising methods for direct synthesis of regioregular polyaromatic polymers on arbitrary insulating surfaces.

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Section: Resultsmentioning

confidence: 99%

Polycyclic aromatic chains on metals and insulating layers by repetitive [3+2] cycloadditions

et al. 2020

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“…The precursors can also be in different forms. Most popular are borazine [35], ammonia borane [36], and diborane [37].…”

Section: Synthesis Methods Of Few-layered H-bn (Fbn)mentioning

confidence: 99%

Few-Layered Hexagonal Boron Nitride: Functionalization, Nanocomposites, and Physicochemical and Biological Properties

Jędrzejczak-Silicka¹,

Trukawka²,

Piotrowska³

et al. 2020

Biochemical Toxicology - Heavy Metals and Nanomaterials

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Hexagonal boron nitride (h-BN) is an analogue of graphite called "white graphene." In the structure of h-BN, B and N atoms substitute C atoms. The boron and nitrogen atoms are linked via strong B-N covalent bonds and form interlocking hexagonal rings. h-BN is used in different areas due to its interesting physical and chemical properties, e.g., in electronics as an insulator and in ceramics, resins, plastics, and paints. Therefore, boron nitride (BN) is also a popular inorganic compound in cosmetic industry (the highest BN concentration up to 25% can be found in eye shadow formulation). It is also widely used in dental cement production (for dental and orthodontic applications). Boron nitride seems to be suitable for biomedical applications; therefore, the cytotoxicity in vitro and in vivo observations of h-BN nanoplates and novel few-layered h-BN-based nanocomposites are still needed. The short-time studies confirm their low cytotoxicity and suggest that BN can be used as a novel drug delivery system; however, medical application needs additional verification in long-term studies.

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“…Furthermore, the interlayer d002-spacing values of ~3.34 Å for all samples were determined to be close to that of highcrystalline bulk value for the commercial hBN samples (Table 1), suggesting a good crystallization rate for each sample after the addition of BaF2. The slightly lower interlayer distance for the 5 wt% BaF2 sample (~3.331 Å) is indicative of the improved d-p interaction occurring between the p-orbital electrons in hBN and those in the d-orbital of barium [45], consequently resulting in a bettercrystallized sample upon the introduction of BaF2. Similar results were observed with the addition of higher BaF2 contents, with the 20 wt% BaF2 sample registering a d002-spacing value of ~3.328 Å, whereas that of the 30 wt% BaF2 sample was ~3.326 Å.…”

Section: Powder Xrd Analysismentioning

confidence: 99%

Improving Formation Conditions and Properties of hBN Nanosheets Through BaF2-assisted Polymer Derived Ceramics (PDCs) Technique

et al. 2020

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Hexagonal boron nitrite (hBN) is an attractive material for many applications such as in electronics as a complement to graphene, in anti-oxidation coatings, light emitters, etc. However, the synthesis of high-quality hBN at cost-effective conditions is still a great challenge. Thus, this work reports on the synthesis of large-area and crystalline hBN nanosheets via the modified polymer derived ceramics (PDCs) process. The addition of both the BaF2 and Li3N, as melting-point reduction and crystallization agents, respectively, led to the production of hBN powders with excellent physicochemical properties at relatively low temperatures and atmospheric pressure conditions. For instance, XRD, Raman, and XPS data revealed improved crystallinity and quality at a decreased formation temperature of 1200 °C upon the addition of 5 wt% of BaF2. Moreover, morphological determination illustrated the formation of multi-layered nanocrystalline and well-defined shaped hBN powders with crystal sizes of 2.74–8.41 ± 0.71 µm in diameter. Despite the compromised thermal stability, as shown by the ease of oxidation at high temperatures, this work paves way for the production of large-scale and high-quality hBN crystals at a relatively low temperature and atmospheric pressure conditions.

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Hexagonal boron nitride monolayers on metal supports: Versatile templates for atoms, molecules and nanostructures

Cited by 212 publications

References 882 publications

Polycyclic aromatic chains on metals and insulating layers by repetitive [3+2] cycloadditions

Polycyclic aromatic chains on metals and insulating layers by repetitive [3+2] cycloadditions

Few-Layered Hexagonal Boron Nitride: Functionalization, Nanocomposites, and Physicochemical and Biological Properties

Improving Formation Conditions and Properties of hBN Nanosheets Through BaF2-assisted Polymer Derived Ceramics (PDCs) Technique

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