Label-free wide range electrochemical detection of β-carotene using solid state assisted synthesis of hexagonal boron nitride nanosheets

2020 ◽  
Vol 44 (37) ◽  
pp. 15919-15927
Author(s):  
Lignesh Durai ◽  
Pinki Yadav ◽  
Harita Pant ◽  
Vadali V. S. S. Srikanth ◽  
Sushmee Badhulika
Keyword(s):  
Solid State ◽  
Boron Nitride ◽  
Electrochemical Detection ◽  
Hexagonal Boron Nitride ◽  
Label Free ◽  
Boron Nitride Nanosheets ◽  
Wide Range ◽  
Β Carotene

Label-free, ultra-selective sensing of β-carotene using hBN nanosheets.

scholarly journals Identifying the Molecular Edge Termination of Exfoliated Hexagonal Boron Nitride Nanosheets with Solid-State NMR Spectroscopy and Plane-Wave DFT Calculations

2019 ◽  
Author(s):  
Rick W. Dorn ◽  
Matthew J. Ryan ◽  
Tae-Hoon Kim ◽  
Tian Wei Goh ◽  
Patrick M. Heintz ◽  
...  
Keyword(s):  
Solid State ◽  
Boron Nitride ◽  
Plane Wave ◽  
Dft Calculations ◽  
Solid State Nmr ◽  
Hexagonal Boron Nitride ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Edge Termination ◽  
Boron Nitride Nanosheets

Hexagonal boron nitride nanosheets (h-BNNS), the isoelectric analog to graphene, have received much attention over the past decade due to their high thermal oxidative resistance, high bandgap, catalytic activity and low cost. The molecular functional groups that terminate boron and nitrogen zigzag and/or armchair edges directly affect their chemical, physical and electronic properties. However, an understanding of the exact molecular edge termination present in h-BNNS is lacking. Here, high-resolution magic-angle spinning (MAS) solid-state NMR (SSNMR) spectroscopy and plane-wave density-functional theory (DFT) calculations are used to determine the exact molecular edge termination in exfoliated h-BNNS. 1H→11B cross-polarization MAS (CPMAS) SSNMR spectra of h-BNNS revealed multiple hydroxyl/oxygen coordinate boron edge sites that were not detectable in direct excitation experiments. A dynamic nuclear polarization (DNP)-enhanced 1H→15N CPMAS spectrum of h-BNNS displayed four distinct 15N resonances while a 2D 1H{14N} dipolar-HMQC spectrum revealed three distinct 14N environments. Plane-wave DFT calculations were used to construct model edge structures and predict the corresponding 11B, 14N and 15N SSNMR spectra. Comparison of the experimental and predicted SSNMR spectra confirms that zigzag and armchair edges with both amine and boron hydroxide/oxide termination are present. The detailed characterization of h-BNNS molecular edge termination will provide usefulness for many material science applications and the techniques outlined here should be applicable to comprehensively understand the molecular edge terminations in other 2D materials.

scholarly journals Identifying the Molecular Edge Termination of Exfoliated Hexagonal Boron Nitride Nanosheets with Solid-State NMR Spectroscopy and Plane-Wave DFT Calculations

2019 ◽  
Author(s):  
Rick W. Dorn ◽  
Matthew J. Ryan ◽  
Tae-Hoon Kim ◽  
Tian Wei Goh ◽  
Patrick M. Heintz ◽  
...  
Keyword(s):  
Solid State ◽  
Boron Nitride ◽  
Plane Wave ◽  
Dft Calculations ◽  
Solid State Nmr ◽  
Hexagonal Boron Nitride ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Edge Termination ◽  
Boron Nitride Nanosheets

Hexagonal boron nitride nanosheets (h-BNNS), the isoelectric analog to graphene, have received much attention over the past decade due to their high thermal oxidative resistance, high bandgap, catalytic activity and low cost. The molecular functional groups that terminate boron and nitrogen zigzag and/or armchair edges directly affect their chemical, physical and electronic properties. However, an understanding of the exact molecular edge termination present in h-BNNS is lacking. Here, high-resolution magic-angle spinning (MAS) solid-state NMR (SSNMR) spectroscopy and plane-wave density-functional theory (DFT) calculations are used to determine the exact molecular edge termination in exfoliated h-BNNS. 1H→11B cross-polarization MAS (CPMAS) SSNMR spectra of h-BNNS revealed multiple hydroxyl/oxygen coordinate boron edge sites that were not detectable in direct excitation experiments. A dynamic nuclear polarization (DNP)-enhanced 1H→15N CPMAS spectrum of h-BNNS displayed four distinct 15N resonances while a 2D 1H{14N} dipolar-HMQC spectrum revealed three distinct 14N environments. Plane-wave DFT calculations were used to construct model edge structures and predict the corresponding 11B, 14N and 15N SSNMR spectra. Comparison of the experimental and predicted SSNMR spectra confirms that zigzag and armchair edges with both amine and boron hydroxide/oxide termination are present. The detailed characterization of h-BNNS molecular edge termination will provide usefulness for many material science applications and the techniques outlined here should be applicable to comprehensively understand the molecular edge terminations in other 2D materials.

Ion-induced coagulation of hexagonal boron nitride nanosheets in aqueous environment

2021 ◽  
Vol 44 ◽  
pp. 100475
Author(s):  
Xiaobin Zhu ◽  
Liang Zhang ◽  
Bin Zuo ◽  
Zhengcun Zhou ◽  
Yifei Yang ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Aqueous Environment ◽  
Boron Nitride Nanosheets

Intrinsic ferromagnetism in hexagonal boron nitride nanosheets

2014 ◽  
Vol 140 (20) ◽  
pp. 204701 ◽  
Author(s):  
M. S. Si ◽  
Daqiang Gao ◽  
Dezheng Yang ◽  
Yong Peng ◽  
Z. Y. Zhang ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Boron Nitride Nanosheets ◽  
Intrinsic Ferromagnetism

Massive Enhancement in Power Output of BoPET-Paper Triboelectric Nanogenerator Using 2D-Hexagonal Boron Nitride Nanosheets

Nano Energy ◽  
2021 ◽  
pp. 106628
Author(s):  
Ainikulangara Sundaran Bhavya ◽  
Harris Varghese ◽  
Achu Chandran ◽  
Kuzhichalil Peethambharan Surendran
Keyword(s):  
Boron Nitride ◽  
Power Output ◽  
Hexagonal Boron Nitride ◽  
Triboelectric Nanogenerator ◽  
Boron Nitride Nanosheets

Thickness-dependent bending modulus of hexagonal boron nitride nanosheets

2009 ◽  
Vol 20 (38) ◽  
pp. 385707 ◽  
Author(s):  
Chun Li ◽  
Yoshio Bando ◽  
Chunyi Zhi ◽  
Yang Huang ◽  
Dmitri Golberg
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Boron Nitride Nanosheets ◽  
Bending Modulus

Defect Functionalization of Hexagonal Boron Nitride Nanosheets

2010 ◽  
Vol 114 (41) ◽  
pp. 17434-17439 ◽  
Author(s):  
Yi Lin ◽  
Tiffany V. Williams ◽  
Wei Cao ◽  
Hani E. Elsayed-Ali ◽  
John W. Connell
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Boron Nitride Nanosheets
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