Applications of carbon quantum dots in lubricant additives: a review
Source abstract
Abstract
Advances in lubricants are vital to the pursuit of energy efficiency and sustainable development. It is well known that the essence of lubricating oil is lubricant additives, especially the friction-reducing and anti-wear additives. Carbon quantum dots (CQDs), a novel zero-dimensional carbon-based nanomaterial, have attained growing expectations in material and chemical sciences because of their extraordinary properties such as low toxicity and environmentally friendly, high chemical and thermal stability, and good designability. Since their discovery, CQDs have shown great potential in many applications including sensors, medicine, photovoltaic devices, biology, and tribology. The latest application of CQDs as the high-performance friction-reducing and anti-wear additives has garnered increasing attention. With the in-depth study, CQDs have gradually exhibited their excellent tribological properties, especially acted as additives in lubricating base oils. This paper has reviewed the progress in the research and development of CQDs-based lubricant additives by introducing lots of successful applications of CQDs-based additives in the present work and then highlighted the friction-reducing and anti-wear property, superiority, as well as the lubrication mechanism of CQDs as an additive, along with some discussion on challenges and perspectives in this significant and promising field. Finally, we offered a series of suggestions for developing the next-generation high-performance CQDs-based lubricant additives. This work presented the carbon quantum dots as the lubricant additives of lubricating base oils.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Carbon and Quantum Dots Applications · Lubricants and Their Additives · Electrochemical sensors and biosensors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (100+)
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1. Bhushan B, Israelachvili JN, Landman U (1995) Nanotribology: friction, wear and lubrication at the atomic scale. Nature 374(6523):607–61610.1038/374607a0 ↗
2. Myshkin NK, Petrokovets MI, Kovalev AV (2005) Tribology of polymers: adhesion, friction, wear, and mass-transfer. Tribol Int 38(11–12):910–92110.1016/j.triboint.2005.07.016 ↗
3. Cai MR, Guo RS, Zhou F, Liu WM (2013) Lubricating a bright future: lubrication contribution to energy saving and low carbon emission. Sci China Technol Sci 56(12):2888–291310.1007/s11431-013-5403-2 ↗
4. Qiao H, Zheng F, Jiang H, Dong KY (2019) The greenhouse effect of the agriculture-economic growth-renewable energy nexus: evidence from G20 countries. Sci Total Environ 671:722–73110.1016/j.scitotenv.2019.03.336 ↗
5. Stephens GL, Kahn BH, Richardson M (2016) The super greenhouse effect in a changing climate. J Clim 29(15):5469–548210.1175/JCLI-D-15-0234.1 ↗
6. Dufresne JL, Eymet V, Crevoisier C (2020) Greenhouse effect: the relative contributions of emission height and total absorption. J Clim 33(9):3827–384410.1175/JCLI-D-19-0193.1 ↗
7. Tan XC, Li H, Guo JX, Gu BH, Zeng Y (2019) Energy-saving and emission-reduction technology selection and CO2 emission reduction potential of China’s iron and steel industry under energy substitution policy. J Clean Prod 222:823–83410.1016/j.jclepro.2019.03.133 ↗
8. Li S, Niu D, Wu L (2018) Evaluation of energy saving and emission reduction effects for electricity retailers in China based on fuzzy combination weighting method. Appl Sci 8(9):1564–158710.3390/app8091564 ↗
9. Hori Y (2016) Hydrodynamic lubrication. Springer, Berlin
10. Pirso J, Letunovitš S, Viljus M (2004) Friction and wear behaviour of cemented carbides. Wear 257(3–4):257–26510.1016/j.wear.2003.12.014 ↗
11. Briscoe WH, Titmuss S, Tiberg F, Thomas RK, McGillivray DJ, Klein J (2006) Boundary lubrication under water. Nature 444(7116):191–19410.1038/nature05196 ↗
12. Wu SA, He F, Xie GX, Bian ZL, Luo JB, Wen SZ (2018) Black phosphorus: degradation favors lubrication. Nano let 18(9):5618–562710.1021/acs.nanolett.8b02092 ↗
13. Ma L, Luo J (2016) Thin film lubrication in the past 20 years. Friction 4(4):280–30210.1007/s40544-016-0135-5 ↗
14. Putignano C, Dini D (2017) Soft matter lubrication: does solid viscoelasticity matter? ACS Appl Mater Inter 9(48):42287–4229510.1021/acsami.7b09381 ↗
15. Tomala A, Karpinska A, Werner WSM, Olver A, Störi H (2010) Tribological properties of additives for water-based lubricants. Wear 269(11–12):804–81010.1016/j.wear.2010.08.008 ↗
16. Li ZX, Ma SH, Zhang G, Wang DA, Zhou F (2018) Soft/hard-coupled amphiphilic polymer nanospheres for water lubrication. ACS Appl Mater Inter 10(10):9178–918710.1021/acsami.8b00405 ↗
17. Niiyama Y, Takeno T, Kurihara K, Adachi K (2017) Effect of sliding history on super-low friction of diamond-like carbon coating in water lubrication. Tribo Lett 65(2):63–7610.1007/s11249-017-0849-1 ↗
18. Ma L, Gaisinskaya-Kipnis A, Kampf N, Klein J (2015) Origins of hydration lubrication. Nat Commun 6(1):1–610.1038/ncomms7060 ↗
19. Zzeyani S, Mikou M, Naja J (2017) Spectroscopic analysis of synthetic lubricating oil. Tribol Int 114:27–3210.1016/j.triboint.2017.04.011 ↗
20. Khan A, Gusain R, Sahai M, Khatri OP (2019) Fatty acids-derived protic ionic liquids as lubricant additive to synthetic lube base oil for enhancement of tribological properties. J Mol Liq 293:111444–11145310.1016/j.molliq.2019.111444 ↗
21. Syahir AZ, Zulkifli NWM, Masjuki HH (2020) Tribological improvement using ionic liquids as additives in synthetic and bio-based lubricants for steel-steel contacts. Tribol T 63(2):235–25010.1080/10402004.2019.1679934 ↗
22. Martini A, Ramasamy US, Len M (2018) Review of viscosity modifier lubricant additives. Tribol Lett 66(2):1–1410.1007/s11249-018-1007-0 ↗
23. Zhou Y, Qu J (2017) Ionic liquids as lubricant additives: a review. ACS Appl Mater Inter 9(4):3209–322210.1021/acsami.6b12489 ↗
24. Joly-Pottuz L, Dassenoy F, Belin M, Vacher B, Martin JM, Fleischer N (2005) Ultralow-friction and wear properties of IF-WS2 under boundary lubrication. Tribol Lett 18(4):477–48510.1007/s11249-005-3607-8 ↗
25. Perez-Martinez CS, Perkin S (2019) Interfacial structure and boundary lubrication of a dicationic ionic liquid. Langmuir 35(48):15444–1545010.1021/acs.langmuir.9b01415 ↗
26. Upadhyay RK, Kumar A (2019) Boundary lubrication properties and contact mechanism of carbon/MoS2 based nanolubricants under steel/steel contact. Coll Interface Sci Commun 31:100186–10019510.1016/j.colcom.2019.100186 ↗
27. Li C, Li ML, Wang XY, Feng WM, Zhang QQ, Wu B, Hu XG (2019) Novel carbon nanoparticles derived from biodiesel soot as lubricant additives. Nanomaterials 9(8):1115–112810.3390/nano9081115 ↗
28. Zhao J, Li YR, He YY, Luo JB (2019) In situ green synthesis of the new sandwichlike nanostructure of Mn3O4/graphene as lubricant additives. ACS Appl Mater Inter 11(40):36931–3693810.1021/acsami.9b08993 ↗
29. Wu C, Wei C, Jin X, Zhang W (2019) Carbon spheres as lubricant additives for improving tribological performance of polyetheretherketone. J Mater Sci 54(6):5127–5135. https://doi.org/10.1007/s10853-018-3177-410.1007/s10853-018-3177-4 ↗
30. Lan P, Iaccino LL, Bao X, Polycarpou AA (2020) The effect of lubricant additives on the tribological performance of oil and gas drilling applications up to 200 °C. Tribol Int 141:105896–10590610.1016/j.triboint.2019.105896 ↗
31. Ma R, Zhao Q, Zhang EH, Zheng DD, Li WM, Wang XB (2020) Synthesis and evaluation of oil-soluble ionic liquids as multifunctional lubricant additives. Tribol Int 151:106446–10645310.1016/j.triboint.2020.106446 ↗
32. Sadanandan AM, Khatri PK, Saxena RC, Jain SL (2020) Guanidine based amino acid derived task specific ionic liquids as noncorrosive lubricant additives for tribological performance. J Mol Liq 313:113527–11353610.1016/j.molliq.2020.113527 ↗
33. He ZB, Min CY, Yang YZ, Zhang K, Dong CK, Zhou YH, Shen WX (2020) Synthesis by partial oxygenation of graphite-like carbon nitride (OCN) decorated with oleic diethanolamide borate (ODAB) for oil-based lubricant additives and its tribological properties. New J Chem 44(14):5377–538510.1039/D0NJ00726A ↗
34. Minami I (2017) Molecular science of lubricant additives. Appl Sci 7(5):445–47710.3390/app7050445 ↗
35. Parenago OP, Kuzmina GN, Zaimovskaya TA (2017) Sulfur-containing molybdenum compounds as high-performance lubricant additives. Petrol Chem 57(8):631–64210.1134/S0965544117080102 ↗
36. Kumari S, Mungse HP, Gusain R, Kumar N, Sugimura H, Khatri OP (2017) Octadecanethiol-grafted molybdenum disulfide nanosheets as oil-dispersible additive for reduction of friction and wear. FlatChem 3:16–2510.1016/j.flatc.2017.06.004 ↗
37. Liu L, Liu ZQ, Huang P, Wu Z, Jiang SY (2016) Protein-induced ultrathin molybdenum disulfide (MoS2) flakes for a water-based lubricating system. RSC Adv 6(114):113315–11332110.1039/C6RA23786J ↗
38. Wan SH, Tieu AK, Xia YN, Zhu HT, Tran BH, Cui SG (2016) An overview of inorganic polymer as potential lubricant additive for high temperature tribology. Tribol Int 102:620–63510.1016/j.triboint.2016.06.010 ↗
39. Xia YQ, Xu XC, Feng X, Chen GX (2015) Leaf-surface wax of desert plants as a potential lubricant additive. Friction 3(3):208–21310.1007/s40544-015-0081-7 ↗
40. Mosey NJ, Müser MH, Woo TK (2005) Molecular mechanisms for the functionality of lubricant additives. Science 307(5715):1612–161510.1126/science.1107895 ↗
41. Johnson DW, Hils JE (2013) Phosphate esters, thiophosphate esters and metal thiophosphates as lubricant additives. Lubricants 1(4):132–14810.3390/lubricants1040132 ↗
42. Li ZP, Li YL, Zhang YW, Ren TH, Zhao YD (2014) Tribological study of hydrolytically stable S-containing alkyl phenylboric esters as lubricant additives. RSC Adv 4(48):25118–2512610.1039/C4RA01672F ↗
43. Paouris L, Rahmani R, Theodossiades S, Rahnejat H, Hunt G, Barton W (2018) Inefficiency predictions in a hypoid gear pair through tribodynamics analysis. Tribol Int 119:631–64410.1016/j.triboint.2017.11.035 ↗
44. Fan X, Wang L, Xia Y (2015) Oil-soluble lithium salts as novel lubricant additives towards improving conductivity and tribological performance of bentone grease. Lubr Sci 27(6):359–36810.1002/ls.1286 ↗
45. Kato S, Sasaki S (2019) Effects of hydraulic oil and lubricant additives on dynamic friction properties under various reciprocating sliding conditions. Friction 8(2):471–48010.1007/s40544-019-0296-0 ↗
46. Stump BC, Zhou Y, Luo HM, Leonard DN, Viola MB, Qu J (2019) New Functionality of ionic liquids as lubricant additives: mitigating rolling contact fatigue. ACS Appl Mater Inter 11(33):30484–3049210.1021/acsami.9b10001 ↗
47. Yang ZQ, Sun CF, Zhang CY, Zhao SJ, Cai MR, Liu ZL, Yu QL (2020) Amino acid ionic liquids as anticorrosive and lubricating additives for water and their environmental impact. Tribol Int 153:106663–10667510.1016/j.triboint.2020.106663 ↗
48. Khan A, Yasa SR, Gusain R, Khatri OP (2020) Oil-miscible, halogen-free, and surface-active lauryl sulphate-derived ionic liquids for enhancement of tribological properties. J Mol Liq 318:114005–11401310.1016/j.molliq.2020.114005 ↗
49. Yu QL, Zhang CY, Dong R, Shi YJ, Wang YR, Bai YY, Zhang JY, Cai MR, et al (2021) Physicochemical and tribological properties of gemini-type halogen-free dicationic ionic liquids. Friction 9:344–35510.1007/s40544-019-0348-5 ↗
50. Antunes M, Donato MT, Paz V, Caetano F, Santos L, Colaço R, Branco LC, Saramago B (2020) Improving the lubrication of silicon surfaces using ionic liquids as oil additives: the effect of sulfur-based functional groups. Tribol Lett 68:1–1410.1007/s11249-020-01308-7 ↗
51. Mu LW, Shi YJ, Guo XJ, Wu J, Ji T, Chen L, Feng X, Lu XH et al (2016) Enriching heteroelements in lignin as lubricating additives for bioionic liquids. ACS Sustain Chem Eng 4(7):3877–388710.1021/acssuschemeng.6b00669 ↗
52. Singh T, Singh R, Verma VK, Nakayama K (2016) A study of N, O and S heterocyclic compounds as extreme pressure lubricant additives. Tribol Int 23(1):41–4610.1016/0301-679X(90)90071-V ↗
53. Yu QL, Zhang CY, Dong R, Shi YJ, Wang YR, Bai YY, Zhang JY, Cai MR et al (2019) Novel N, P-containing oil-soluble ionic liquids with excellent tribological and anti-corrosion performance. Tribol Int 132:118–12910.1016/j.triboint.2018.12.002 ↗
54. Li Z, Ren T (2017) Synergistic effects between alkylphosphate-ammonium ionic liquid and alkylphenylborate as lubricant additives in rapeseed oil. Tribol Int 109:373–38110.1016/j.triboint.2016.11.032 ↗
55. Uflyand IE, Zhinzhilo VA, Burlakova VE (2019) Metal-containing nanomaterials as lubricant additives: state-of-the-art and future development. Friction 7(2):93–11610.1007/s40544-019-0261-y ↗
56. Kumara C, Luo HM, Leonard DN, Meyer HM, Qu J (2017) Organic-modified silver nanoparticles as lubricant additives. ACS Appl Mater Inter 9(42):37227–3723710.1021/acsami.7b13683 ↗
57. Choi Y, Lee C, Hwang Y, Park M, Lee J, Choi C, Jung M (2009) Tribological behavior of copper nanoparticles as additives in oil. Curr Appl Phys 9(2):124–12710.1016/j.cap.2008.12.050 ↗
58. Jaiswal V, Umrao S, Rastogi RB, Kumar R, Srivastava A (2016) Synthesis, characterization, and tribological evaluation of TiO2-reinforced boron and nitrogen co-doped reduced graphene oxide based hybrid nanomaterials as efficient anti-wear lubricant additives. ACS Appl Mater Inter 8(18):11698–1171010.1021/acsami.6b01876 ↗
59. Espina CJ, Fernandez GA, José DRHÁ (2017) Unctuous ZrO2 nanoparticles with improved functional attributes as lubricant additives. Nanot 28(49):495704–49571410.1088/1361-6528/aa93ca ↗
60. Shrestha BK, Trital HM, Rajbhandari A (2020) Synthesis and characterization of CuO-ZnO nano additive for lubricant. Sci World 13(13):33–3610.3126/sw.v13i13.30504 ↗
61. Zhang XH, Xu HX, Wang JT, Ye X, Lei WN, Xue MQ, Tang H, Li CS (2016) Synthesis of ultrathin WS2 nanosheets and their tribological properties as lubricant additives. Nanoscale Res lett 11(1):1–910.1186/s11671-016-1659-3 ↗
62. Ripoll MR, Tomala AM, Pirker L, Remškar M (2020) In-situ formation of MoS2 and WS2 tribofilms by the synergy between transition metal oxide nanoparticles and sulphur-containing oil additives. Tribol Lett 68(1):1–1310.1007/s11249-019-1243-y ↗
63. Martin JM, Onodera T, Bouchet MIDB, Hatakeyama N, Miyamoto A (2013) Anti-wear chemistry of ZDDP and calcium borate nano-additive Coupling experiments chemical hardness predictions and MD calculations. Tribol Lett 50(1):95–10410.1007/s11249-013-0108-z ↗
64. Akbulut M (2012) Nanoparticle-based lubrication systems. J Powder Metall Min 1(1):1–310.4172/2168-9806.1000e101 ↗
65. Wright RAE, Wang K, Qu J, Zhao B (2016) Oil-soluble polymer brush grafted nanoparticles as effective lubricant additives for friction and wear reduction. Angew Chem 128(30):8798–880210.1002/ange.201603663 ↗
66. Zhang ZJ, Simionesie D, Schaschke C (2014) Graphite and hybrid nanomaterials as lubricant additives. Lubricants 2(2):44–6510.3390/lubricants2020044 ↗
67. Salah N, Abdel-Wahab MS, Alshahrie A, Alharbi ND, Khan ZH (2017) Carbon nanotubes of oil fly ash as lubricant additives for different base oils and their tribology performance. RSC Adv 7(64):40295–4030210.1039/C7RA07155H ↗
68. Su F, Chen G, Huang P (2020) Lubricating performances of graphene oxide and onion-like carbon as water-based lubricant additives for smooth and sand-blasted steel discs. Friction 8(1):47–5710.1007/s40544-018-0237-3 ↗
69. Xie HM, Dang SH, Jiang B, Xiang L, Zhou S, Sheng HR, Yang TH, Pan FS (2019) Tribological performances of SiO2/graphene combinations as water-based lubricant additives for magnesium alloy rolling. Appl Surf Sci 475:847–85610.1016/j.apsusc.2019.01.062 ↗
70. Ren BJ, Gao L, Xie BT, Li MJ, Zhang SD, Zu GQ, Ran X (2020) Tribological properties and anti-wear mechanism of ZnO@graphene core-shell nanoparticles as lubricant additives. Tribol Int 144:106114–10412110.1016/j.triboint.2019.106114 ↗
71. Ali I, Kucherova A, Memetov N (2019) Advances in carbon nanomaterials as lubricants modifiers. J Mol Liq 279:251–26610.1016/j.molliq.2019.01.113 ↗
72. Zhai W, Srikanth N, Kong LB, Zhou K (2017) Carbon nanomaterials in tribology. Carbon 119:150–17110.1016/j.carbon.2017.04.027 ↗
73. Song H, Wang Z, Yang J (2016) Tribological properties of graphene oxide and carbon spheres as lubricating additives. Appl Phys A 122(10):1–910.1007/s00339-016-0469-x ↗
74. Tan SV, Shi HY, Fu LL, Ma J, Du X, Song J, Liu YH, Zeng QD et al (2020) Superlubricity of fullerene derivatives induced by host-guest assembly. ACS Appl Mater Inter 12(16):18924–1893310.1021/acsami.0c02726 ↗
75. Liu C, Guo Y, Wang D (2019) PEI-RGO nanosheets as a nanoadditive for enhancing the tribological properties of water-based lubricants. Tribol Int 140:105851–10586010.1016/j.triboint.2019.105851 ↗
76. Raina A, Anand A (2017) Tribological investigation of diamond nanoparticles for steel/steel contacts in boundary lubrication regime. Appl Nanosci 7(7):371–38810.1007/s13204-017-0590-y ↗
77. Peña-Parás L, Maldonado-Cortés D, García P (2017) Tribological performance of halloysite clay nanotubes as green lubricant additives. Wear 376:885–89210.1016/j.wear.2017.01.044 ↗
78. He C, Yan HH, Li XJ, Wang XH (2021) One-step rapid fabrication of high-purity onion-like carbons as efficient lubrication additives. J Mater Sci 56(2):1286–1297. https://doi.org/10.1007/s10853-020-05311-010.1007/s10853-020-05311-0 ↗
79. Das R, Bandyopadhyay R, Pramanik P (2018) Carbon quantum dots from natural resource: a review. Mater Today Chem 8:96–10910.1016/j.mtchem.2018.03.003 ↗
80. Wang R, Lu KQ, Tang ZR, Xu YJ (2017) Recent progress in carbon quantum dots: synthesis, properties and applications in photocatalysis. J Mater Chem A 5(8):3717–373410.1039/C6TA08660H ↗
81. Huang SP, Li WS, Han P, Zhou X, Cheng JW, Wen HY, Xue WM (2019) Carbon quantum dots: synthesis, properties, and sensing applications as a potential clinical analytical method. Anal Methods 11(17):2240–225810.1039/C9AY00068B ↗
82. Xu XY, Ray R, Gu YL, Ploehn HJ, Gearheart L, Raker K, Scrivens WA (2004) Electrophoretic analysis and purification of fluorescent single-walled carbon nanotube fragments. J Am Chem Soc 126(40):12736–1273710.1021/ja040082h ↗
83. Sun YP, Zhou B, Lin Y, Wang W, Fernando KAS, Pathak P, Meziani MJ, Harruff BA et al (2006) Quantum-sized carbon dots for bright and colorful photoluminescence. J Am Chem Soc 128(24):7756–775710.1021/ja062677d ↗
84. Wang Y, Hu A (2014) Carbon quantum dots: synthesis, properties and applications. J Mater Chem C 2(34):6921–693910.1039/C4TC00988F ↗
85. Liang QH, Ma WJ, Shi Y, Li Z, Yang XM (2013) Easy synthesis of highly fluorescent carbon quantum dots from gelatin and their luminescent properties and applications. Carbon 60:421–42810.1016/j.carbon.2013.04.055 ↗
86. Alam AM, Park BY, Ghouri ZK, Park M, Kim HY (2015) Synthesis of carbon quantum dots from cabbage with down-and up-conversion photoluminescence properties: excellent imaging agent for biomedical applications. Green Chem 17(7):3791–379710.1039/C5GC00686D ↗
87. Mintz KJ, Zhou Y, Leblanc RM (2019) Recent development of carbon quantum dots regarding their optical properties, photoluminescence mechanism, and core structure. Nanoscale 11(11):4634–465210.1039/C8NR10059D ↗
88. Zheng XT, Ananthanarayanan A, Luo KQ, Chen P (2015) Glowing graphene quantum dots and carbon dots: properties, syntheses, and biological applications. Small 11(14):1620–163610.1002/smll.201402648 ↗
89. Molaei MJ (2020) The optical properties and solar energy conversion applications of carbon quantum dots: a review. Sol Energy 196:549–56610.1016/j.solener.2019.12.036 ↗
90. Lim SY, Shen W, Gao Z (2020) Carbon quantum dots and their applications. Chem Soc Rev 44(1):362–38110.1039/C4CS00269E ↗
91. Molaei MJ (2019) A review on nanostructured carbon quantum dots and their applications in biotechnology, sensors, and chemiluminescence. Talanta 196:456–47810.1016/j.talanta.2018.12.042 ↗
92. Yuan T, Meng T, He P, Shi YX, Li YC, Li XH, Fan LZ, Yang SH (2019) Carbon quantum dots: an emerging material for optoelectronic applications. J Mater Chem C 7(23):6820–683510.1039/C9TC01730E ↗
93. Zhao DL, Chung TS (2018) Applications of carbon quantum dots (CQDs) in membrane technologies: a review. Water Res 147:43–4910.1016/j.watres.2018.09.040 ↗
94. Tyagi A, Tripathi KM, Singh N, Choudhary S, Gupta RK (2016) Green synthesis of carbon quantum dots from lemon peel waste: applications in sensing and photocatalysis. RSC Adv 6(76):72423–7243210.1039/C6RA10488F ↗
95. Molaei MJ (2019) Carbon quantum dots and their biomedical and therapeutic applications: a review. RSC Adv 9(12):6460–648110.1039/C8RA08088G ↗
96. Devi P, Saini S, Kim KH (2019) The advanced role of carbon quantum dots in nanomedical applications. Biosens Bioelectron 141:111158–11117410.1016/j.bios.2019.02.059 ↗
97. Kou XL, Jiang SC, Park SJ, Meng LY (2020) A review: recent advances in preparations and applications of heteroatom-doped carbon quantum dots. Dalton T 49(21):6915–693810.1039/D0DT01004A ↗
98. He P, Shi YX, Meng T, Yuan T, Li YC, Li XH, Zhang Y, Fan LZ et al (2020) Recent advances in white light-emitting diodes of carbon quantum dots. Nanoscale 12(8):4826–483210.1039/C9NR10958G ↗
99. Walekar LS, Zheng MD, Zheng LH, Long MC (2019) Selenium and nitrogen co-doped carbon quantum dots as a fluorescent probe for perfluorooctanoic acid. Microchim Acta 186(5):1–910.1007/s00604-019-3400-2 ↗
100. Xu L, Bai X, Guo LK, Yang SJ, Jin PK, Yang JL (2019) Facial fabrication of carbon quantum dots (CDs)-modified N-TiO2-x nanocomposite for the efficient photoreduction of Cr(VI) under visible light. Chem Eng J 357:473–48610.1016/j.cej.2018.09.172 ↗