{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T15:29:37Z","timestamp":1789658977635,"version":"4.0.1"},"reference-count":50,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2026,9,15]],"date-time":"2026-09-15T00:00:00Z","timestamp":1789430400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"NSFC","doi-asserted-by":"crossref","award":["22469010"],"award-info":[{"award-number":["22469010"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100001809","name":"NSFC","doi-asserted-by":"crossref","award":["U24A2063"],"award-info":[{"award-number":["U24A2063"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"}]},{"award":["22469010"],"award-info":[{"award-number":["22469010"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]},{"award":["U24A2063"],"award-info":[{"award-number":["U24A2063"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Yunnan Province Natural Science Fund","award":["202501AT070331"],"award-info":[{"award-number":["202501AT070331"]}]},{"name":"Double First-Class Initiative Project of Yunnan University","award":["CZ22621801"],"award-info":[{"award-number":["CZ22621801"]}],"id":[{"id":"https:\/\/ror.org\/0040axw97","id-type":"ROR","asserted-by":"crossref"}]},{"award":["CZ22621801"],"award-info":[{"award-number":["CZ22621801"]}],"id":[{"id":"https:\/\/ror.org\/0040axw97","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Yunnan Xingdian Young Talent Project","award":["KKXX202452039"],"award-info":[{"award-number":["KKXX202452039"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nanomaterials"],"abstract":"<jats:p>Colored reflective paints are attractive for building cooling and aesthetics. However, coloration of the paints could paradoxically increase the solar absorption, decreasing the cooling capabilities. In this work, we introduced a novel coloration strategy by using metal ion-doped ZnO nanoparticles as fillers to achieve chromatic paints with high cooling capabilities. With inorganic binder of aqueous K2SiO3 solution, it observed that the Mg-doping enabled the paint to deliver a high cooling power of 103.8 W\/m2, while Fe-, Cu- and Co-doping strategies created pale buff (L* = 84.6, a* = 2.9, b* = 16.3), olive green (L* = 66.8, a* = \u22127.9, b* = 18.7), and pale gray (L* = 81.5, a* = \u22120.6, b* = 2.1) colors with highly remained cooling power of 83.9, 75.4 and 61.1 W\/m2, respectively. Physical characterizations indicated that the maintained crystal structures and similar band gaps could be the main reasons for high cooling capabilities of the colored paints. In addition, the high temperature differences and strong adhesion capabilities of paints on concrete substrates enabled them to present promising cooling energy savings for buildings.<\/jats:p>","DOI":"10.3390\/nano16181155","type":"journal-article","created":{"date-parts":[[2026,9,15]],"date-time":"2026-09-15T08:16:48Z","timestamp":1789460208000},"page":"1155","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Colored Reflective Paints with Doped ZnO Fillers for High Cooling Capabilities"],"prefix":"10.3390","volume":"16","author":[{"given":"Shaojun","family":"Xu","sequence":"first","affiliation":[{"name":"Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"investigation","vocabulary":"credit"}]},{"given":"Yan","family":"Peng","sequence":"additional","affiliation":[{"name":"Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"writing-original-draft","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7170-5767","authenticated-orcid":false,"given":"Zhongqiu","family":"Tong","sequence":"additional","affiliation":[{"name":"Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"supervision","vocabulary":"credit"},{"role":"funding-acquisition","vocabulary":"credit"}]},{"given":"Xingang","family":"Li","sequence":"additional","affiliation":[{"name":"Jiangxi Construction Engineering Co., Ltd., Nanchang 330000, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"supervision","vocabulary":"credit"}]},{"given":"Feiyan","family":"Long","sequence":"additional","affiliation":[{"name":"Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"formal-analysis","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7884-4471","authenticated-orcid":false,"given":"Jie","family":"Yu","sequence":"additional","affiliation":[{"name":"Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"supervision","vocabulary":"credit"}]},{"given":"Shaoyuan","family":"Li","sequence":"additional","affiliation":[{"name":"Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"resources","vocabulary":"credit"}]},{"given":"Yueming","family":"Wang","sequence":"additional","affiliation":[{"name":"Jiangxi Construction Engineering Co., Ltd., Nanchang 330000, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"methodology","vocabulary":"credit"}]},{"given":"Wenhui","family":"Ma","sequence":"additional","affiliation":[{"name":"School of Engineering, Yunnan University, Kunming 650091, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"supervision","vocabulary":"credit"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,15]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"e06717","DOI":"10.1002\/aenm.202506717","article-title":"Mie-Resonant Thermochromic Safe Architectures for All-Season Radiative Thermal Management","volume":"16","author":"Cui","year":"2026","journal-title":"Adv. Energy Mater."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"324","DOI":"10.1007\/s40820-025-01835-9","article-title":"Radiative Cooling Materials for Extreme Environmental Applications","volume":"17","author":"Xu","year":"2025","journal-title":"Nano-Micro Lett."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"786","DOI":"10.1126\/science.abb0971","article-title":"Terrestrial Radiative Cooling: Using the Cold Universe as a Renewable and Sustainable Energy Source","volume":"370","author":"Yin","year":"2020","journal-title":"Science"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"684","DOI":"10.1126\/science.adi2224","article-title":"A Solution-Processed Radiative Cooling Glass","volume":"382","author":"Zhao","year":"2023","journal-title":"Science"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"31333","DOI":"10.1039\/D6TA02138G","article-title":"Upgrading of Silicon Slag into Radiative Cooling Materials by Controlled Oxidation with Oxygen Carriers","volume":"14","author":"Xiao","year":"2026","journal-title":"J. Mater. Chem. A"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"170260","DOI":"10.1016\/j.cej.2025.170260","article-title":"Montmorillonite-Derived Mg-Doped NaAlSiO4 for Radiative Cooling Applications","volume":"525","author":"Xiang","year":"2025","journal-title":"Chem. Eng. J."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"128770","DOI":"10.1016\/j.applthermaleng.2025.128770","article-title":"Superhydrophobic Cement-Based Radiative Cooling Paint for Durable and Scalable Applications","volume":"281","author":"Xu","year":"2025","journal-title":"Appl. Therm. 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Cells"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"114084","DOI":"10.1016\/j.enbuild.2024.114084","article-title":"Experimental and Numerical Investigation on Energy-Saving Performance of Radiative Cooling Coating for Metal Container Office","volume":"310","author":"Xuan","year":"2024","journal-title":"Energy Build."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Lei, M., Zhao, S., Cai, Q., Guo, Z., Zhao, Z., Tao, S., and Zhang, R. (Chin. J. Chem. Eng., 2026). Colored Passive Daytime Radiative Cooling Paints: From Fundamentals to Applications, Chin. J. Chem. Eng., in press.","DOI":"10.1016\/j.cjche.2026.05.025"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"137292","DOI":"10.1016\/j.energy.2025.137292","article-title":"Bilayer Fluorescent Colored Radiative Cooling Coatings for Building Energy Saving","volume":"332","author":"Wang","year":"2025","journal-title":"Energy"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"135119","DOI":"10.1016\/j.colsurfa.2024.135119","article-title":"Colorful, Eco-Friendly and Scalable Passive Radiative Cooling Coatings Integrating Thermal Insulation and Self-Cleaning Properties","volume":"702","author":"Man","year":"2024","journal-title":"Colloids Surf. A Physicochem. Eng. Asp."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"57832","DOI":"10.1021\/acsami.0c14792","article-title":"Cross-Linked Porous Polymeric Coating without a Metal-Reflective Layer for Sub-Ambient Radiative Cooling","volume":"12","author":"Son","year":"2020","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"119125","DOI":"10.1016\/j.applthermaleng.2022.119125","article-title":"Colored Passive Daytime Radiative Cooling Coatings Based on Dielectric and Plasmonic Spheres","volume":"216","author":"Chen","year":"2022","journal-title":"Appl. Therm. Eng."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"116776","DOI":"10.1016\/j.applthermaleng.2021.116776","article-title":"Improving Cabin Thermal Environment of Parked Vehicles under Direct Sunlight Using a Daytime Radiative Cooling Cover","volume":"190","author":"Lv","year":"2021","journal-title":"Appl. Therm. Eng."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"eadf7207","DOI":"10.1126\/sciadv.adf7207","article-title":"Ultralight Plasmonic Structural Color Paint","volume":"9","author":"Franklin","year":"2023","journal-title":"Sci. Adv."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"55591","DOI":"10.1021\/acsami.1c19471","article-title":"Bioinspired Color Elastomers Combining Structural, Dye, and Background Colors","volume":"13","author":"Shi","year":"2021","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"5898","DOI":"10.1039\/D0CS00706D","article-title":"From Colloidal Particles to Photonic Crystals: Advances in Self-Assembly and Their Emerging Applications","volume":"50","author":"Cai","year":"2021","journal-title":"Chem. Soc. Rev."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"18","DOI":"10.1021\/acsphotonics.0c00947","article-title":"Nanophotonic Structural Colors","volume":"8","author":"Dong","year":"2021","journal-title":"ACS Photonics"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1907626","DOI":"10.1002\/smll.201907626","article-title":"Structural Color Materials for Optical Anticounterfeiting","volume":"16","author":"Hong","year":"2020","journal-title":"Small"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"2100296","DOI":"10.1002\/admt.202100296","article-title":"Structural Color Materials from Natural Polymers","volume":"6","author":"Zhang","year":"2021","journal-title":"Adv. Mater. Technol."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"13668","DOI":"10.1021\/acssuschemeng.3c03488","article-title":"Self-Cleaning Red-Toned Perylene Poly(Aryl Ether) Film with Superior NIR Reflectance for Passive Radiative Cooling","volume":"11","author":"Yang","year":"2023","journal-title":"ACS Sustain. Chem. Eng."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"e2300856120","DOI":"10.1073\/pnas.2300856120","article-title":"Colorful Low-Emissivity Paints for Space Heating and Cooling Energy Savings","volume":"120","author":"Peng","year":"2023","journal-title":"Proc. Natl. Acad. Sci. USA"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"100239","DOI":"10.1016\/j.mtnano.2022.100239","article-title":"Colored Radiative Cooling Coatings Using Phosphor Dyes","volume":"19","author":"Xu","year":"2022","journal-title":"Mater. Today Nano"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"e22922","DOI":"10.1002\/adma.202522922","article-title":"Photonic Inverse Opal-Enabled Seamless Interface of Bilayer Structure for Color Regulation and Robust Passive Radiative Cooling","volume":"38","author":"Wei","year":"2026","journal-title":"Adv. Mater."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"e03473","DOI":"10.1002\/adom.202503473","article-title":"Single-Layer Vivid-Colored Radiative Cooling Paint Enabled by Ultrahigh NIR Reflectance","volume":"14","author":"Park","year":"2026","journal-title":"Adv. Opt. Mater."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"044602","DOI":"10.1103\/PhysRevMaterials.3.044602","article-title":"Searching for Materials with High Refractive Index and Wide Band Gap: A First-Principles High-Throughput Study","volume":"3","author":"Naccarato","year":"2019","journal-title":"Phys. Rev. Mater."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"7086","DOI":"10.1038\/s41598-025-90425-1","article-title":"Experimental Investigation of Structural and Optical Properties of Mn-Doped ZnO Thin Films Deposited by Pneumatic Spray Technique","volume":"15","author":"Rahal","year":"2025","journal-title":"Sci. Rep."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"417283","DOI":"10.1016\/j.physb.2025.417283","article-title":"Theoretical and Experimental Study of Structural, Electronic and Optical Properties of Cobalt-Doped Zinc Oxide","volume":"712","author":"Murtaza","year":"2025","journal-title":"Phys. B Condens. Matter"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"106259","DOI":"10.1016\/j.nanoen.2021.106259","article-title":"Review of Radiative Cooling Materials: Performance Evaluation and Design Approaches","volume":"88","author":"Yu","year":"2021","journal-title":"Nano Energy"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"398","DOI":"10.1016\/j.renene.2022.05.008","article-title":"Sonochemically-Coated Transparent Wood with ZnO: Passive Radiative Cooling Materials for Energy Saving Applications","volume":"193","author":"Hu","year":"2022","journal-title":"Renew. Energy"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"5507","DOI":"10.1016\/j.ceramint.2019.11.051","article-title":"Doped ZnO Nanostructures with Selected Elements\u2014Structural, Morphology and Optical Properties: A Review","volume":"46","year":"2020","journal-title":"Ceram. Int."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"182554","DOI":"10.1016\/j.jallcom.2025.182554","article-title":"Effect of Cobalt (Co2+)-Doping on the Green Pigment Property of ZnO Nanostructures","volume":"1037","author":"Palanivel","year":"2025","journal-title":"J. Alloys Compd."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"119258","DOI":"10.1016\/j.actamat.2023.119258","article-title":"On the Vibrational Properties of Transition Metal Doped ZnO: Surface, Defect, and Bandgap Engineering","volume":"259","author":"Lage","year":"2023","journal-title":"Acta Mater."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"2512","DOI":"10.1039\/D0RA08670C","article-title":"Journey of ZnO Quantum Dots from Undoped to Rare-Earth and Transition Metal-Doped and Their Applications","volume":"11","author":"Singh","year":"2021","journal-title":"RSC Adv."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"2292","DOI":"10.1038\/s41598-022-06092-z","article-title":"Structural Differences and Adsorption Behaviour of Alkaline Metals Doped Zinc Oxide Nanoparticles","volume":"12","author":"Manivannan","year":"2022","journal-title":"Sci. Rep."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"14952","DOI":"10.1021\/acsomega.2c07412","article-title":"Impact on the Photocatalytic Dye Degradation of Morphology and Annealing-Induced Defects in Zinc Oxide Nanostructures","volume":"8","author":"Colak","year":"2023","journal-title":"ACS Omega"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"105517","DOI":"10.1016\/j.nanoen.2020.105517","article-title":"Radiative Cooling: Fundamental Physics, Atmospheric Influences, Materials and Structural Engineering, Applications and Beyond","volume":"80","author":"Lin","year":"2021","journal-title":"Nano Energy"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"17462","DOI":"10.1007\/s10854-022-08591-1","article-title":"Single and Bivalent Metal-Cations Co-Doped ZnO Nanopowders: Synthesis and Characterization","volume":"33","author":"Reddy","year":"2022","journal-title":"J. Mater. Sci. Mater. Electron."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"17130","DOI":"10.1021\/acs.iecr.9b01561","article-title":"Progress on Transition Metal-Doped ZnO Nanoparticles and Its Application","volume":"58","author":"Singh","year":"2019","journal-title":"Ind. Eng. Chem. Res."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"214","DOI":"10.1039\/D0NA00693A","article-title":"Optical Properties and Carrier Dynamics in Co-Doped ZnO Nanorods","volume":"3","author":"Sivan","year":"2021","journal-title":"Nanoscale Adv."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"77","DOI":"10.1016\/j.matpr.2021.12.238","article-title":"Comparative Study of Optical Properties of ZnO and Zn0.95La0.05O Thin Films","volume":"55","author":"Ayana","year":"2022","journal-title":"Mater. Today Proc."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"114791","DOI":"10.1016\/j.ssc.2022.114791","article-title":"The Optical Properties of Mg-Doped ZnO Quantum Dots","volume":"350","author":"Wu","year":"2022","journal-title":"Solid State Commun."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"4450","DOI":"10.1039\/D0NA00499E","article-title":"Influence of Cu Doping on the Local Electronic and Magnetic Properties of ZnO nanostructures","volume":"2","author":"Bhardwaj","year":"2020","journal-title":"Nanoscale Adv."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"15226","DOI":"10.1021\/acs.iecr.0c01178","article-title":"Keep Cool: Polyhedral ZnO@ZIF-8 Polymer Coatings for Daytime Radiative Cooling","volume":"59","author":"Kang","year":"2020","journal-title":"Ind. Eng. Chem. Res."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"5510193","DOI":"10.1155\/2021\/5510193","article-title":"The Study\u2019s Chemical Interaction of the Sodium Silicate Solution with Extender Pigments to Investigate High Heat Resistance Silicate Coating","volume":"2021","author":"Le","year":"2021","journal-title":"J. Anal. Methods Chem."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"141181","DOI":"10.1016\/j.conbuildmat.2025.141181","article-title":"Strengthening the New-Old Mortar Interfacial Bonding through Sodium Methyl Silicate Comparing with Rubber Latex","volume":"475","author":"Yao","year":"2025","journal-title":"Constr. Build. Mater."},{"key":"ref_49","doi-asserted-by":"crossref","unstructured":"Li, J., Song, J., Zhang, S., Liu, W., Cui, Z., and Li, W. (2024). The Effects of Various Silicate Coatings on the Durability of Concrete: Mechanisms and Implications. Buildings, 14.","DOI":"10.3390\/buildings14020381"},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"119056","DOI":"10.1016\/j.conbuildmat.2020.119056","article-title":"Effect of Silicate Modulus on Tensile Properties and Microstructure of Waterproof Coating Based on Polymer and Sodium Silicate-Activated GGBS","volume":"252","author":"Chang","year":"2020","journal-title":"Constr. Build. Mater."}],"container-title":["Nanomaterials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2079-4991\/16\/18\/1155\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T04:14:27Z","timestamp":1789618467000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2079-4991\/16\/18\/1155"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9,15]]},"references-count":50,"journal-issue":{"issue":"18","published-online":{"date-parts":[[2026,9]]}},"alternative-id":["nano16181155"],"URL":"https:\/\/doi.org\/10.3390\/nano16181155","relation":{},"ISSN":["2079-4991"],"issn-type":[{"value":"2079-4991","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,9,15]]}}}