Fig. 2: Chemical change from BoL-C to BoL-LC.
From: Liquid crystalline 2D borophene oxide for inorganic optical devices
a Infrared (IR) spectrum change from BoL-C to BoL-LC. The peak of O–H stretching (red dashed line) was disappeared and the peak shape of the B–O stretching (orange solid line) was changed. Solid line around 2400 cm−1 is derived from CO2 gas in the air. b Considerable chemical structure change. Dehydration process from hydroxyl groups on boron (B-OH) to form oxygen bridging structure occurs at the edge parts. The distorted edge structure prevents the 2D layers from crystallization. This change assists the formation of the liquid crystal phase. c Thermogravimetry (TG) and differential thermogravimetry (DTG) spectra of the reaction from BoL-C to BoL-LC. d Mass spectra (MS) at 130 °C of TG-MS measurement. The peak corresponding to H2O was observed at the position of m/z = 18. m stands for mass and z stands for charge number of ions. e, f XPS spectra of BoL-C and BoL-LC at B 1 s region, respectively.
