Emergence of fluorescence in boron nitride nanoflakes and its application in bioimaging

Kumar, Vijayesh; Nikhil, Kumar; Roy, Partha; Lahiri, Debrupa; Lahiri, Indranil

doi:10.1039/c6ra05288f

Cited by 41 publications

(12 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Not a transition metal dichalcogenide, BN does not exhibit absorption/emission in the 600-800 nm range. Shown in the upper portion of Figure 4c and in line with previous reports, [53,54] untreated BN flakes (shown in black) exhibit a sharp peak at ≈190 nm (6.5 eV) and a shoulder at 260 nm ascribed to donor-acceptor pair transitions involving native defects in BN such as nitrogen vacancies. [55] After irradiation for 70 min, the f-BN spectrum also shows absorption due to π-π transitions in the carbon domains, as seen in peak F at 225 nm.…”

Section: Wwwadvopticalmatdesupporting

confidence: 89%

“…Shown in the upper portion of Figure 4c and in line with previous reports, [53,54] untreated BN flakes (shown in black) exhibit a sharp peak at ≈190 nm (6.5 eV) and a shoulder at 260 nm ascribed to donor-acceptor pair transitions involving native defects in BN such as nitrogen vacancies. Shown in the upper portion of Figure 4c and in line with previous reports, [53,54] untreated BN flakes (shown in black) exhibit a sharp peak at ≈190 nm (6.5 eV) and a shoulder at 260 nm ascribed to donor-acceptor pair transitions involving native defects in BN such as nitrogen vacancies.…”

Section: Wwwadvopticalmatdesupporting

confidence: 89%

See 1 more Smart Citation

Simultaneous Fabrication and Functionalization of Nanoparticles of 2D Materials with Hybrid Optical Properties

Ibrahim

Irannejad

Wales

et al. 2018

Advanced Optical Materials

View full text Add to dashboard Cite

biomedicine, [2,3] tribology, [4] photonics, [5] and electrocatalysis, [6] among others. Significant progress has been made recently in fabricating and functionalizing 2D nanosheets of transition metal dichalcogenides. [7] This progress has focused on the functionalization of mono-or few-layer nanosheets with lateral dimensions greater than 100 nm by combining chemical exfoliation, [8][9][10][11][12] micromechanical exfoliation, [13] or liquid exfoliation [14] with the reaction of functionalities. The formation and functionalization of smaller 2D nanoparticles or quantum dots, on the other hand, is still in its infancy.In what has been cited as the first direct evidence of covalent functionalization of a nanoscale transition metal dichalcogenide, Tuxen et al. produced MoS 2 monolayer nanoclusters in ultrahigh vacuum on a gold substrate and attached dibenzothiophene molecules to the clusters via controlled vapor exposure. [15,16] Beyond substrate-supported nanoclusters, the functionalization of nongraphene 2D nanoparticles suspended in solution was reported last year. Atkin et al. combined ultrasonication of WS 2 with microwave treatment in a citric acid-containing solution to produce monolayer WS 2 nanosheets ≈20-80 nm in diameter decorated with 2-5 nm carbon dots. [6] Jung et al. impinged BN flakes with super-heated nanoparticles then exposed them to water vapor to produce edge-hydroxylated BN quantum dots with 8 nm lateral size. [2] These techniques for fabricating and functionalizing 2D nanosheets and smaller nanoparticles are relatively slow (in some cases requiring several days), often require dangerous chemicals and elevated temperatures, and their demonstration has been material specific. In the case of functionalized 2D nanoparticles other than graphene, such as functionalized MoS 2 , WS 2 , and BN quantum dots, potentially exciting multifunctional optical properties have not been realized. The ability to produce a variety of hybrid 2D nanoparticles that possess the optical properties of both the host 2D material and functional groups would be extremely valuable for many of the aforementioned applications.We introduce a rapid femtosecond laser technique that simultaneously reduces the dimensions of flakes of 2D materials to a few nanometers and dissociates solvent molecules to bond with the edges of the freshly cleaved 2D sheets, in order to produce functionalized nanoparticles of 2D materials. Etha nol, a common and inexpensive solvent, is used to facilitate functionalization A general, rapid technique is introduced to simultaneously fabricate and functionalize nanoparticles of 2D materials. A femtosecond laser is used to irradiate flakes of 2D materials in an ethanol-containing solvent. The highly energetic laser pulses exfoliate and cleave the flakes into nanosheets with diameters of ≈3 nm and simultaneously dissociate the solvent molecules. The dissociated carbon and oxygen atoms bond with the freshly cleaved 2D nanoparticles to satisfy edge sites, resulting in the formation of hybrid 2D nanoparticles...

show abstract

Section: Wwwadvopticalmatdesupporting

confidence: 89%

Section: Wwwadvopticalmatdesupporting

confidence: 89%

Simultaneous Fabrication and Functionalization of Nanoparticles of 2D Materials with Hybrid Optical Properties

Ibrahim

Irannejad

Wales

et al. 2018

Advanced Optical Materials

View full text Add to dashboard Cite

show abstract

“…Since the discovery of graphene with its extraordinary physical and chemical properties, a variety of other 2D materials have attracted wide interest . Among them, hexagonal boron nitride nanosheets (BNNSs) have excellent thermal conductivity and stability, ultrahigh electrical insulation and breakdown strength, outstanding mechanical strength and stiffness, good impermeability to gases and liquids, high transparency to visible‐light and deep‐UV absorption, as well as good biocompatibility and biodegradability . Those unique properties make BNNSs attractive fillers in composites for a wide range of applications .…”

mentioning

confidence: 99%

Simultaneous Production and Functionalization of Boron Nitride Nanosheets by Sugar‐Assisted Mechanochemical Exfoliation

et al. 2019

View full text Add to dashboard Cite

Due to their extraordinary properties, boron nitride nanosheets (BNNSs) have great promise for many applications. However, the difficulty of their efficient preparation and their poor dispersibility in liquids are the current factors that limit this. A simple yet efficient sugar‐assisted mechanochemical exfoliation (SAMCE) method is developed here to simultaneously achieve their exfoliation and functionalization. This method has a high actual exfoliation yield of 87.3%, and the resultant BNNSs are covalently grafted with sugar (sucrose) molecules, and are well dispersed in both water and organic liquids. A new mechanical force–induced exfoliation and chemical grafting mechanism is proposed based on experimental and density functional theory investigations. Thanks to the good dispersibility of the nanosheets, flexible and transparent BNNS/poly(vinyl alcohol) (PVA) composite films with multifunctionality is fabricated. Compared to pure PVA films, the composite films have a remarkably improved tensile strength and thermal dissipation capability. Noteworthy, they are flame retardant and can effectively block light from the deep blue to the UV region. This SAMCE production method has proven to be highly efficient, green, low cost, and scalable, and is extended to the exfoliation and functionalization of other two‐dimensional (2D) materials including MoS2, WS2, and graphite.

show abstract

“…56–60 The high biocompatibility of hBN has resulted in a recent surge of studies exploring biomedical technologies based on this material, including drug delivery, fluorescent labeling in cells, and tissue engineering. 61–67 …”

mentioning

confidence: 99%

Assessing and Mitigating the Hazard Potential of Two-Dimensional Materials

Guiney¹,

Wang

Xia

et al. 2018

ACS Nano

View full text Add to dashboard Cite

The family of two-dimensional (2D) materials is comprised of a continually expanding palette of unique compositions and properties with potential applications in electronics, optoelectronics, energy capture and storage, catalysis, and nanomedicine. To accelerate the implementation of 2D materials in widely disseminated technologies, human health and environmental implications need to be addressed. While extensive research has focused on assessing the toxicity and environmental fate of graphene and related carbon nanomaterials, the potential hazards of other 2D materials have only recently begun to be explored. Herein, the toxicity and environmental fate of post-carbon 2D materials, such as transition metal dichalcogenides, hexagonal boron nitride, and black phosphorus, are reviewed as a function of their preparation methods and surface functionalization. Specifically, we delineate how the hazard potential of 2D materials is directly related to structural parameters and physicochemical properties, and how experimental design is critical to the accurate elucidation of the underlying toxicological mechanisms. Finally, a multidisciplinary approach for streamlining the hazard assessment of emerging 2D materials is outlined, thereby providing a pathway for accelerating their safe use in a range of technologically relevant contexts.

show abstract

Emergence of fluorescence in boron nitride nanoflakes and its application in bioimaging

Abstract: Hexagonal boron nitride (h-BN) nanoflakes show fluorescence and can be used for bio-imaging.

Cited by 41 publications

References 35 publications

Simultaneous Fabrication and Functionalization of Nanoparticles of 2D Materials with Hybrid Optical Properties

Simultaneous Fabrication and Functionalization of Nanoparticles of 2D Materials with Hybrid Optical Properties

Simultaneous Production and Functionalization of Boron Nitride Nanosheets by Sugar‐Assisted Mechanochemical Exfoliation

Assessing and Mitigating the Hazard Potential of Two-Dimensional Materials

Contact Info

Product

Resources

About