Table 1.

Reaction conditions and methods to produce 2D-BNNs.

Precursors	Environmental conditions	Catalyst	Methods	Purifying	Product	References
Boron-rich conducting electrodes	N2 gas	Nickel, cobalt	Plasma-arc discharge	None	hBN Nanococoons	Cuming and Zettl, 2000
(B(OMe)3)	NH3 gas, 800–1,500°C	None	CVD	None	BN spheres	Wood et al., 2006; Tang et al., 2008
(B(OMe)3)	NH3 and Ar gas, 800–1,500°C	None	CVD	None	Hollow BNs	Li et al., 2017
NH4BF4 and NaN3	N2 gas, 250°C, 450 MPa	S	Ball milling	(HCl), C6H6, ddH2O	hBN	Lian et al., 2010
H3BO3, C3H6N6	NH3 gas, 1600°C	None	CVD	None	BN	Ansaloni and Sousa, 2013
Carbon nanocages, B2O3	NH3 gas, 1350-1450°C	None	Elemental substitution reaction	None	BN and BCN nanocages	Suryavanshi et al., 2014
Boron powder	NH3 gas	Fes/Fe2O3	TCVD	None	BN nanosheets	Ansaloni and Sousa, 2013
H3BO3, Colemanite, B2O3	NH3 gas, 1300°C	None	CVD	None	hBN	Sen et al., 2018