Editing Boron nitride (section)

====Raman characteristics====
Raman spectroscopy has been a useful tool to study a variety of 2D materials, and the Raman signature of high-quality atomically thin boron nitride was first reported by Gorbachev et al. in 2011.<ref>{{Cite journal|last1=Gorbachev|first1=Roman V.|last2=Riaz|first2=Ibtsam|last3=Nair|first3=Rahul R.|last4=Jalil|first4=Rashid|last5=Britnell|first5=Liam|last6=Belle|first6=Branson D.|last7=Hill|first7=Ernie W.|last8=Novoselov|first8=Kostya S.|last9=Watanabe|first9=Kenji|date=2011-01-07|title=Hunting for Monolayer Boron Nitride: Optical and Raman Signatures|journal=Small|volume=7|issue=4|pages=465–468|doi=10.1002/smll.201001628|pmid=21360804|arxiv=1008.2868|s2cid=17344540}}</ref> and Li et al.<ref name="LiCervenka2014"/> However, the two reported Raman results of monolayer boron nitride did not agree with each other. Cai et al., therefore, conducted systematic experimental and theoretical studies to reveal the intrinsic Raman spectrum of atomically thin boron nitride.<ref>{{Cite journal|last1=Cai|first1=Qiran|last2=Scullion|first2=Declan|last3=Falin|first3=Aleksey|last4=Watanabe|first4=Kenji|last5=Taniguchi|first5=Takashi|last6=Chen|first6=Ying|last7=Santos|first7=Elton J. G.|last8=Li|first8=Lu Hua|date=2017|title=Raman signature and phonon dispersion of atomically thin boron nitride|journal=Nanoscale|volume=9|issue=9|pages=3059–3067|doi=10.1039/c6nr09312d|pmid=28191567|url=https://pure.qub.ac.uk/portal/en/publications/raman-signature-and-phonon-dispersion-of-atomically-thin-boron-nitride(5f58d958-22ab-450f-97fb-cd7c0f25f5b4).html|arxiv=2008.01656|s2cid=206046676}}</ref> It reveals that atomically thin boron nitride without interaction with a substrate has a G band frequency similar to that of bulk hexagonal boron nitride, but strain induced by the substrate can cause Raman shifts. Nevertheless, the Raman intensity of G band of atomically thin boron nitride can be used to estimate layer thickness and sample quality.[[Image:STMnm-2.JPG|thumb|left|150px|BN nanomesh observed with a [[scanning tunneling microscope]]. The center of each ring corresponds to the center of the pores]]
[[File:Oil absorption by BN aerogel.jpg|thumb|upright=1.5|Top: absorption of [[cyclohexane]] by BN aerogel. Cyclohexane is stained with [[Sudan II]] red dye and is floating on water. Bottom: reuse of the aerogel after burning in air.<ref name=nat>{{cite journal|doi=10.1038/srep10337|pmid=25976019|title=Ultralight boron nitride aerogels via template-assisted chemical vapor deposition|journal=Scientific Reports|volume=5|pages=10337|year=2015|last1=Song|first1=Yangxi|last2=Li|first2=Bin|last3=Yang|first3=Siwei|last4=Ding|first4=Guqiao|last5=Zhang|first5=Changrui|last6=Xie|first6=Xiaoming|pmc=4432566|bibcode=2015NatSR...510337S}}</ref>]]