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Nanomaterials 2020, 10, 200 4 of 12 to 530 nm. These are typical size-dependent PL properties [22]. The property of excitation-dependent PLindicatedthepolydispersityoftheas-preparedMoS QDs[23]. Nanomaterials 2020, 10, 200 2 4 of 13 Figure 2. (a) TEM pattern of MoS2 quantum dots (QDs); (b) partial enlarged drawing of (a); (c) XRD Figure 2. (a) TEM pattern of MoS2 quantum dots (QDs); (b) partial enlarged drawing of (a); (c) XRD pattern of MoS2 QDs; (d) fluorescence spectrum of MoS2 QDs. pattern of MoS2 QDs; (d) fluorescence spectrum of MoS2 QDs. The photoluminescence (PL) spectra of the MoS2 QDs aqueous solutions were measured at varTiohuesetrxicbiotaltoiognicwalapvelrefnogrmthsa,nacseshoofwpnarianffiFinguoriels2dw.iWthitdhieffxecrietanttioMnwoSaveQleDngltohasdinincgreasinaglfurobmricant 3.2. Friction Property of MoS2 QDs in Paroline Oil 290 to 370 nm, the PL emission peaks shifted to longer wavelengths. The PL spectra of the MoS2 QD additive is shown in Figure 3. The coefficients of friction (COF) of paraffin oils with different additive suspension exhibited a strong emission peak at 430 nm under an excitation wavelength of 360 nm. amounts of MoS2 QDs were measured at an applied load of 6 N and reciprocating frequency of 1.5 Hz, With the increase in excitation wavelength from 360 to 450 nm, the PL emission peaks shifted from as presented in Figure 3a,b. One can observe relatively larger fluctuations in the friction response 430 to 530 nm. These are typical size-dependent PL properties [22]. The property of excitation- of pure paraffin oils, in comparison to the pure paraffin oil samples with MoS2 QDs, whose COF dependent PL indicated the polydispersity of the as-prepared MoS2 QDs [23]. was as high as 0.169, and the COF was found to increase with time in the initial stage during the running-in period. 3.2. Friction Property of MoS2 QDs in Paroline Oil Along with the loading of MoS2 QDs into paraffin oil, the COF of the nanoparticle oil reduced by The tribological performance of paraffin oils with different MoS2 QD loading as a lubricant much more than that of pure paraffin oil. The lowest COF of 0.061 was obtained by the oil sample with additive is shown in Figure 3. The coefficients of friction (COF) of paraffin oils with different additive 0.3 wt.% MoS2 QDs. Moreover, Figure 3b (partial enlargement of Figure 3a) shows the influence of amounts of MoS2 QDs were measured at an applied load of 6 N and reciprocating frequency of 1.5 particle concentration on the COF of the MoS2 QD oil suspension, indicating that the average COF was Hz, as presented in Figure 3a,b. One can observe relatively larger fluctuations in the friction response influenced by the MoS2 QD concentration. The average COF obviously fell from 0.16 to 0.061 in the of pure paraffin oils, in comparison to the pure paraffin oil samples with MoS2 QDs, whose COF was range of 0.1 to 0.5 wt.% MoS2 QDs, reflecting that the addition of nanoparticle lubricants strengthened as high as 0.169, and the COF was found to increase with time in the initial stage during the running- the sliding response when stabilizing for additive amounts below 0.3 wt.%. However, the average in period. COF showed a slightly increasing trend from 0.061 to 0.065 in the range of 0.3 wt.% to 0.5 wt.% MoS2 Along with the loading of MoS2 QDs into paraffin oil, the COF of the nanoparticle oil reduced QDs. Furthermore, the COF tended to be stable after rubbing, and the corresponding average COF in by much more than that of pure paraffin oil. The lowest COF of 0.061 was obtained by the oil sample thestableperiodforhigherconcentrationsofMoS QDspresentedaloweranti-frictionalproperty, 2 with 0.3 wt.% MoS2 QDs. Moreover, Figure 3b (partial enlargement of Figure 3a) shows the influence as shown in Figure 3c, which is consistent with our previous report [24]. The relevant tribological of particle concentration on the COF of the MoS2 QD oil suspension, indicating that the average COF mechanismisduetotheMoS QDsparticlesathigherconcentrationaccumulatingintheinletofthe was influenced by the MoS2 Q2D concentration. The average COF obviously fell from 0.16 to 0.061 in batlhl-eonra-dngiseccoofn0t.a1cttoare0a.5,wht.i%chMcaouSs2esQaDnsi,nrseufffilectienngtsthuaptptlhyeofaldudbirtiocannotfandansotapravratitciolenliunbtrhiceacnotsntact zosntree[n2g5t]h.eTnheedrtuhnensilnidgi-nignrpeesrpiondsieswofhgerneastasbiiglinziifincgafnocreatdodtihtievreeagmuloautinotns obefltorwibo0l.o3gwicta.%lp.eHrofowrmevaenr,ceto actheertavinereaxgtenCtO.FReshdouwciendgathsleigrhutnlyningcr-einaspinegritordenidsbfreonmefi0c.0ia6l1ttoi0m.0p6r5oivninthgetrhaenganetoi-ff0r.i3ctwiotn.%altpor0o.5perty. wt.% MoS2 QDs. Furthermore, the COF tended to be stable after rubbing, and the corresponding The formation of a boundary lubrication film is the main reason for the stability of the friction coefficient. average COF in the stable period for higher concentrations of MoS2 QDs presented a lower anti- frictional property, as shown in Figure 3c, which is consistent with our previous report [24]. The 2PDF Image | Nano-MoS2 Quantum Dots as Liquid Lubricant Additive for Tribo
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