Crystalline borophene quantum dots and their derivative boron nanospheres

Abstract

An efficient strategy was proposed to prepare crystalline borophene quantum dots with two-photo fluorescence and their derivative boron nanospheres.

Bottom-up synthesized crystalline boron quantum dots with nonvolatile memory effects through one-step hydrothermal polymerization of ammonium pentaborane and boric acid

“…The XRD patterns of Fig. 3a disclose the crystal structure of the as-prepared BQDs, which is indexed to the β-rhombohedral boron (PDF #80-0323), 8,22 indicating the formation of crystalline BQDs. These results are in good accordance with the structural features obtained by high-resolution TEM analysis (Fig.…”

“…0.28 nm have a superlattice structure, corresponding to the (018) planes of β-rhombohedral boron, which is similar to the β 12 -type borophene structure according to the previous studies. 8,21 The high angle annular dark field scanning TEM image of Fig. 2f combined with AFM images (Fig.…”

“…4,5 The physical and chemical properties of boron nanomaterials have been completely different from bulk boron due to the loss of predominantly three-dimensional bonding configurations. 6–8 Owing to the classical quantum confinement and edge effects, ultrafine boron quantum dots (BQDs), as another branch of boron nanomaterials, have been successfully prepared and applied in photo electronics, 8,9 energy storage, 10 biomedicine, 11–13 and memory devices. 14…”

“…To date, several BQD polymorphs with different atomic structures have been prepared by exfoliating from bulk boron through ultrasonic energy, 8–10,13,14 which is referred to as a top-down approach. Tai et al 14 reported a synthesis of semiconductor BQDs from the expanded bulk boron powders via a probe ultrasonic approach and initiated the evaluation in memory devices by injecting the BQDs into polyvinyl pyrrolidone (PVP) as an active layer.…”

Richly electron-deficient BCxO3−x anodes with enhanced reaction kinetics for sodium/potassium-ion batteries

“…7,[17][18][19][20][21][22] The introduction of electron deficiency is an effective solution to enhance the energy storage capability of anode materials through increasing the reactive sites, boosting ion transport, and reducing the energy barrier during continuous insertion/extraction of ions. 7,9,[23][24][25][26][27] Therefore, enriching electron deficiencies in the carbon skeleton is expected to deliver superior sodium/potassium storage capacity. Notably, owing to the electron-deficient nature of boron atoms, doping boron could effectively activate the inert electronic structure in the carbon skeleton, resulting in remarkable charge transfer between sodium/potassium and the substrate.…”