Needle-like single crystalline wires of TaSe3 were massively synthesized using the chemical vapor transport method. Since the wedged-shaped single TaSe3 molecular chains were stacked along the b-axis by weak van der Waals interactions, a few layers of TaSe3 flakes could be easily isolated using a typical mechanical exfoliation method. The exfoliated TaSe3 flakes had an anisotropic planar structure, and the number of layers could be controlled by a repeated peeling process until a monolayer of TaSe3 nanoribbon was obtained. Through atomic force and scanning Kelvin probe microscope analyses, it was found that the variation in the work function with the thickness of the TaSe3 flakes was due to the interlayer screening effect. We believe that our results will not only help to add a novel quasi-1D block for nanoelectronics devices based on 2D van der Waals heterostructures, but also provide crucial information for designing proper contacts in device architecture.
Figure 5. (a) AFM height image; (b) identical SKPM image of the exfoliated TaSe3 3 flakes on a 300 nm SiO2/Si substrate; (c,d) height/potential energy profiles of the flakes in (a) and (b); and (e,f) variations SiO2/Si substrate; (c,d) height/potential energy profiles of the flakes in (a) and (b); and (e,f) variations in the potential energy difference and work function, respectively, according to the thickness of the in the potential energy difference and work function, respectively, according to the thickness of the TaSe3flakes. TaSe3 flakes. 4. Conclusions 4. Conclusions Inthisstudy, wesuccessfullydemonstratedthatneedle-likeTaSe3 crystals can be exfoliated to a chIna itnh-ibs assteuddyq,uwaesi s-1uDccelassyfeurleldy dstermucotnusrter.ateTdh ethtahti cnkenedesles-l(iokrenTuamSeb3ecrryosftalalsy cearns)boefeTxafSoeli3atfeladkteosa wcahsacino-nbtarosellde dqbuyasrie-1pDea tleadyeerxefdo lsiatrtiuocntuarned. ,Tehveenthtuicakllnye, sasm (oornonluamyebreTra oSef3lanyaenrosr) ibobf oTnaSwea3sfolabkteasin weda.s TchornoutrgohlleAdFMbyarnedpeSaKtPedM eaxnfoallyiastiiso,nwaenvde,r iefiveedntthuaatlltyh,e ac hmaonngoelianytehreTwaSoerk3 nfuanncotrioibnbdonep wenadseodbotanintheed. thTihckronuegssho Af FthMe aTnaSde S3KflPaMke sandauleystios,t wheei vneterirfliaeyde trhsactr etheen icnhganefgfee citn. tWhe wanotrikci fpuantecttihoant doeuprernedsuedltsown tilhle htehlpickinnedsesv oeflotphien TgaaSned3 fdlaekseigsn dinuge tnoextht-eg iennteerralatiyoenr dscerveiecnesinbgaeseffdecotn. W2De avndtWicisphaetetetrhoastt rouucrt ureres.ults will help in developing and designing next-generation devices based on 2D vdWs heterostructure. Supplementary Materials: The following are available online at http://www.mdpi.com/1996-1944/12/15/2462/s1, Figure S1: (a) OM and (b) AFM image of exfoliated TaSe3 flakes on 300 nm SiO2/Si substrate. (c) Line profile of the Supplementary Materials: The following are available online at www.mdpi.com/xxx/s1, Figure S1: (a) OM and corresponding TaSe3 flake, as marked in (b). (b) AFM image of exfoliated TaSe3 flakes on 300 nm SiO2/Si substrate. (c) Line profile of the corresponding TaSe3 Author Contributions: Conceptualization and Supervision, J.-H.L. and J.-Y.C.; SKPM analysis, B.J.K. and B.J.J.; flake, as marked in (b). synthesis, S.O., S.C. and K.H.C.; investigation, T.N., S.H.L., H.K.L., I.J.C., M.-K.H. and H.K.Y. Author Contributions: Conceptualization and Supervision, J.-H.L. and J.-Y.C.; SKPM analysis, B.J.K. and B.J.J.; Funding: This work was supported by the Nano Material Technology Development Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2019R1F1A1063170 and 2009-0082580). J.H. Lee acknowledges support from the Presidential Postdoctoral Fellowship Program of the NRF Funding: This work was supported by the Nano Material Technology Development Program through the in Korea (2014R1A6A3A04058169). National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2019R1F1A1063170 and 2009-0082580). J.H. Lee acknowledges support from the Presidential Postdoctoral Fellowship Program of the NRF in Korea (2014R1A6A3A04058169).This work was supported by the Nano Material Technology Development Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2019R1F1A1063170 and 2009-0082580). J.H. Lee acknowledges support from the Presidential Postdoctoral Fellowship Program of the NRF in Korea (2014R1A6A3A04058169).
