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Nanomaterials 2020, 10, 200 Nanomaterials 2020, 10, 200 3 of 12 3 of 13 2.3. Characterization 2.3. Characterization 3. Results and Discussion 3.1. Characterization of MoS2 QDs 3.1. Characterization of MoS2 QDs FFigigurre1..Schemattiicdiiaaggrraamooffbbalal-llo-no-nd-idscistcritbroibmoemtert.er. X-ray diffraction (XRD) results were obtained on a D8 Advance X-ray diffractometer (D8 advance, X-Ray diffraction (XRD) results were obtained on a D8 Advance X-ray diffractometer (D8 Bruker, Karlsruhe, Germany). X-ray photoelectron spectroscopy (XPS, AXIS Ultrabld, Kratos, UK) was advance, Bruker, Karlsruhe, Germany). X-ray photoelectron spectroscopy (XPS, AXIS Ultrabld, useKdrattosa,nUaKly)zweatshuesetdrutcotaunraeloyzfeMthoeSstQruDctsu.rTeroafnMsmoSis2sQioDns.ETleracntrsomnisMsiiocnroEslceocptreon(TMEiMcr,oTsceocnpea(TEGM,F30, 2 TM 2 FETIeCconmapaGnyF,3H0i,llFsEbIoCroo,mOpRa,nUyS,AH)ilwlsabsoruos,eOdRto, UobSsAe)rvweatsheusmedortpohoblosgeryvoeftMheomSoQrpDhso.loTghyeovfisMcoosSit2yof 2 lubQrDicsa.tTinhge ovislscowsiatsy toefsltuebdriucsaitninggaoiclaspwilalsarteysvteidscuosminegtearc. aTphilelawryevairssccoamrsetoefr.GTCher1w5ebaarlslcsawrseorfeGoCbsr1e5rved balls were observed by an optical microscope. The wear scars and Energy Dispersive Spectrum (EDS, by an optical microscope. The wear scars and Energy Dispersive Spectrum (EDS, SU3500, Oxford SU3500, Oxford Instruments, Abingdon, Oxfordshire, UK) images of GCr15 discs were obtained by Instruments, Abingdon, Oxfordshire, UK) images of GCr15 discs were obtained by scanning electron scanning electron microscopy (SEM, VEGA 3 LMH/LMU, TESCAN, Brno, Czech Republic), with an microscopy (SEM, VEGA 3 LMH/LMU, TESCAN, Brno, Czech Republic), with an accelerating voltage accelerating voltage of about 20 kV and a corresponding current value of 7 μA. Three-dimensional of about 20 kV and a corresponding current value of 7 μA. Three-dimensional (3D) profiles of the worn (3D) profiles of the worn surface were obtained using a laser scanning confocal microscope (OLS4000, surface were obtained using a laser scanning confocal microscope (OLS4000, OLYMPUS Company, OLYMPUS Company, Tokyo, Japan). Tokyo, Japan). 3. Results and Discussion TEM images of the resultant MoS2 QDs are shown in Figure 2. The average diameter of MoS2 TEM images of the resultant MoS2 QDs are shown in Figure 2. The average diameter of MoS2 QDs QDs was about 3 nm, indicating the excellent monodispersity of MoS2 QDs, which were well was about 3 nm, indicating the excellent monodispersity of MoS2 QDs, which were well dispersed and dispersed and ranged from 1.5 to 5 nm (Figure 2a). The paralleled and ordered lattice fringe can be ranged from 1.5 to 5 nm (Figure 2a). The paralleled and ordered lattice fringe can be observed in the observed in the TEM map shown in Figure 2b, which illustrates the high crystallinity of the MoS2 TEM map shown in Figure 2b, which illustrates the high crystallinity of the MoS2 QDs. The lattice QDs. The lattice fringe spacing was about 0.2 nm, which matches well with previously reported fringe spacing was about 0.2 nm, which matches well with previously reported values for crystal values for crystal MoS2 [20]. At this size, MoS2 QDs are small enough to have quantum confinement MoS [20].Atthissize,MoS QDsaresmallenoughtohavequantumconfinementeffectsandsmall-size 22 effects and small-size effects. X-ray diffraction (XRD) spectroscopy was used to test the crystal effects. X-ray diffraction (XRD) spectroscopy was used to test the crystal structure of MoS QDs. structure of MoS2 QDs. As shown in Figure 2c, bulk MoS2 (before being smashed by the wheel sond2 e) AsshowninFigure2c,bulkMoS (beforebeingsmashedbythewheelsonde)hadseveralobviously had several obviously strong diff2raction peaks at 2θ = 32.7°, 39.6°, 49.8°, 58.3°, and 60.4°, which were ◦◦◦◦ ◦ straosnsgigdneiffdrtaocthioen(1p0e0a),k(s1a03t)2,θ(1=053),2(.1710, )3,9a.n6d,(4191.28) f,a5c8e.s3, r,easpnedct6i0v.e4ly, winhdicahtiwngertehatssbiuglnkeMdotoS2thaes(a100), (10m3)u,l(t1il0a5y)e,r(s1t1ru0)c,tuanred. M(1o1r2e)ofvaecre,ss,ormesepleocwtievreplye,aiknsdaicta2tθin=g2t9h°a,t2bθu=lk39M.6o°,S2θh=as44a.2m°,u2lθtil=ay49e.r8s°,trauncdture. ◦◦◦◦◦ Mo2θreo=v6e0r.,2°socmoueldlobweeorbpseravkesda,tw2hθic=h2w9er,e2aθs=sig3n9e.6dt,o2θth=e(4040.42),,(210θ3=),4(090.86),,(a1n0d5),2aθn=d6(00.28)fcaocuesld,be respectively (JC-PDF (03-065-1951)). In addition, no peaks could be observed in the XRD patterns of observed, which were assigned to the (004), (103), (006), (105), and (008) faces, respectively (JC-PDF MoS2 QDs, since the materials were thin or presented as monolayers, revealing no intense (03-065-1951)). In addition, no peaks could be observed in the XRD patterns of MoS2 QDs, since the interference on the aligned crystal planes [21]. The XRD result indicated that the resultant product materials were thin or presented as monolayers, revealing no intense interference on the aligned crystal was a thin layer. suspension exhibited a strong emission peak at 430 nm under an excitation wavelength of 360 nm. With the increase in excitation wavelength from 360 to 450 nm, the PL emission peaks shifted from 430 planes [21]. The XRD result indicated that the resultant product was a thin layer. The photoluminescence (PL) spectra of the MoS2 QDs aqueous solutions were measured at various excitation wavelengths, as shown in Figure 2d. With excitation wavelengths increasing from 290 to 370 nm, the PL emission peaks shifted to longer wavelengths. The PL spectra of the MoS2 QD 2 TM 2PDF Image | Nano-MoS2 Quantum Dots as Liquid Lubricant Additive for Tribo
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