Preparation And Electrical Characteristic Of Boron Nitride Nanoribbons

The boron nitride nanoribbon(Boron Nitride Nanoribbon)is an ultra-thin two-dimensional III-V nanomaterial.According to the edge state chiral classification,BNNR can be divided into zigzag nanoribbons and armchair nanoribbons.The first-principle calculations show that the band gap of the zigzag BNNR is related to the width of the nanoribbons and can be adjusted by the external electric field and varying degrees of edge hydrogenation.Although bulk hexagonal boron nitride(Hexagonal Boron Nitride)crystals are electrically insulating,the BNNR can be made semi-metallic electrically conductive by edge hydrogenation,fluorination,and oxygen functionalization.Therefore,BNNR is of great significance for applications such as nanoscale electrons,spintronics,and optoelectronics.All these applications require a lot of high quality BNNR.However,the synthesis of BNNR is quite challenging and the current production of BNNR is very low.Based on the above problems,the subject has conducted the following research: 1)Preparation of BNNR by using alkali metal catalysts;2)Study on controllable growth conditions of BNNR feature sizes;3)Prepare BNNR test electrodes and perform corresponding electrical characteristics test and analysis.By using an alkali metal catalyst,lithium nitrate,we can make it possible to efficiently produce high-purity BNNRs.Analyzing various experimental conditions,we explore the four conditions of catalyst concentration,reaction temperature,gas flow rate and reaction time;In the catalyst concentration range of 1mol/L to 2mol/L,the prepared BNNR yields the highest;The reaction temperature is higher the ratio of length to width of the prepared BNNR is larger;The greater the gas flow is,the smaller the impurity concentration is;The longer the reaction time is,the thinner the BNNR is.Electrode photolithography and magnetron sputtering method can be used to prepare an interdigital electrode structure with an electrode width of 20?m and an electrode gap of 2?m.Analysis of the electrical characteristics shows that the BNNR exhibits good electrical properties.Compared to the boron nitride nanotube(Boron Nitride Nanotube)with a bandgap width of 5.5 e V,the conductive properties of BNNRs are better.The electrical characteristics of multipleBNNRs are affected by the length-width ratio of itself,and the greater the aspect ratio is,the better the electrical properties are;the electrical properties of a single BNNR exhibit Coulomb-Blockade.