Jamilur R. Ansari , Kitae Park , Kambiz Sadeghi , Jongchul Seo
{"title":"碳量子点修饰二硫化钼的制备及其在超高氧障纳米复合包装薄膜中的应用","authors":"Jamilur R. Ansari , Kitae Park , Kambiz Sadeghi , Jongchul Seo","doi":"10.1016/j.fpsl.2025.101504","DOIUrl":null,"url":null,"abstract":"<div><div>Polyvinyl alcohol (PVA), a biodegradable polymer, has attracted considerable interest in the food packaging industry. However, the efficacy of PVA films as food packaging materials is limited owing to their inherently highlight transmittance, hydrophilicity, and solubility in water. Emerging two-dimensional materials, particularly transition metal dichalcogenides, exhibit significant potential in enhancing the mechanical, thermal, optical, ultraviolet-blocking, and oxygen barrier properties of polymer-based nanocomposites. In this study, few-layered water-dispersible MoS<sub>2</sub> nanosheets were synthesized via ultrasonic mixing and liquid exfoliation and integrated with Ag-doped nitrogen-functionalized carbon quantum dots (Ag-NCQDs), referred to as MoS<sub>2</sub>-Ag-NCQDs. Incorporating only 1 wt% of MoS<sub>2</sub>-Ag-NCQDs into a PVA matrix resulted in notable improvements in crystallinity, thermal stability, and oxygen barrier properties. The improved crystallinity of the polymer matrix constrained the gas molecule mobility by increasing diffusion pathways and lowering the permeation rates. Notably, the incorporation of MoS<sub>2</sub>-Ag-NCQD nanomaterials significantly enhanced the oxygen barrier performance, yielding a 99.8 % reduction in the oxygen transmission rate with that of pure PVA films. This remarkable improvement is attributed to the enhanced crystallinity, high aspect ratio, and superior exfoliation of the MoS<sub>2</sub> nanosheets, which facilitate effective interactions with gas molecules and impede their movement. Furthermore, the PVA/MoS<sub>2</sub>-Ag-NCQDs nanocomposite films significantly improved ginger's preservation and nutritional integrity, thereby extending its shelf life. This study highlights the potential of MoS<sub>2</sub>-Ag-NCQD nanomaterials for improving oxygen barrier performance, advancing pharmaceutical applications, and enhancing ultraviolet shielding when used in food packaging systems.</div></div>","PeriodicalId":12377,"journal":{"name":"Food Packaging and Shelf Life","volume":"49 ","pages":"Article 101504"},"PeriodicalIF":8.5000,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Preparation of MoS2 modified with carbon quantum dots and its application to extremely high oxygen-barrier nanocomposite films for packaging\",\"authors\":\"Jamilur R. Ansari , Kitae Park , Kambiz Sadeghi , Jongchul Seo\",\"doi\":\"10.1016/j.fpsl.2025.101504\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Polyvinyl alcohol (PVA), a biodegradable polymer, has attracted considerable interest in the food packaging industry. However, the efficacy of PVA films as food packaging materials is limited owing to their inherently highlight transmittance, hydrophilicity, and solubility in water. Emerging two-dimensional materials, particularly transition metal dichalcogenides, exhibit significant potential in enhancing the mechanical, thermal, optical, ultraviolet-blocking, and oxygen barrier properties of polymer-based nanocomposites. In this study, few-layered water-dispersible MoS<sub>2</sub> nanosheets were synthesized via ultrasonic mixing and liquid exfoliation and integrated with Ag-doped nitrogen-functionalized carbon quantum dots (Ag-NCQDs), referred to as MoS<sub>2</sub>-Ag-NCQDs. Incorporating only 1 wt% of MoS<sub>2</sub>-Ag-NCQDs into a PVA matrix resulted in notable improvements in crystallinity, thermal stability, and oxygen barrier properties. The improved crystallinity of the polymer matrix constrained the gas molecule mobility by increasing diffusion pathways and lowering the permeation rates. Notably, the incorporation of MoS<sub>2</sub>-Ag-NCQD nanomaterials significantly enhanced the oxygen barrier performance, yielding a 99.8 % reduction in the oxygen transmission rate with that of pure PVA films. This remarkable improvement is attributed to the enhanced crystallinity, high aspect ratio, and superior exfoliation of the MoS<sub>2</sub> nanosheets, which facilitate effective interactions with gas molecules and impede their movement. Furthermore, the PVA/MoS<sub>2</sub>-Ag-NCQDs nanocomposite films significantly improved ginger's preservation and nutritional integrity, thereby extending its shelf life. This study highlights the potential of MoS<sub>2</sub>-Ag-NCQD nanomaterials for improving oxygen barrier performance, advancing pharmaceutical applications, and enhancing ultraviolet shielding when used in food packaging systems.</div></div>\",\"PeriodicalId\":12377,\"journal\":{\"name\":\"Food Packaging and Shelf Life\",\"volume\":\"49 \",\"pages\":\"Article 101504\"},\"PeriodicalIF\":8.5000,\"publicationDate\":\"2025-04-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Food Packaging and Shelf Life\",\"FirstCategoryId\":\"97\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2214289425000742\",\"RegionNum\":1,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"FOOD SCIENCE & TECHNOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Food Packaging and Shelf Life","FirstCategoryId":"97","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2214289425000742","RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"FOOD SCIENCE & TECHNOLOGY","Score":null,"Total":0}
Preparation of MoS2 modified with carbon quantum dots and its application to extremely high oxygen-barrier nanocomposite films for packaging
Polyvinyl alcohol (PVA), a biodegradable polymer, has attracted considerable interest in the food packaging industry. However, the efficacy of PVA films as food packaging materials is limited owing to their inherently highlight transmittance, hydrophilicity, and solubility in water. Emerging two-dimensional materials, particularly transition metal dichalcogenides, exhibit significant potential in enhancing the mechanical, thermal, optical, ultraviolet-blocking, and oxygen barrier properties of polymer-based nanocomposites. In this study, few-layered water-dispersible MoS2 nanosheets were synthesized via ultrasonic mixing and liquid exfoliation and integrated with Ag-doped nitrogen-functionalized carbon quantum dots (Ag-NCQDs), referred to as MoS2-Ag-NCQDs. Incorporating only 1 wt% of MoS2-Ag-NCQDs into a PVA matrix resulted in notable improvements in crystallinity, thermal stability, and oxygen barrier properties. The improved crystallinity of the polymer matrix constrained the gas molecule mobility by increasing diffusion pathways and lowering the permeation rates. Notably, the incorporation of MoS2-Ag-NCQD nanomaterials significantly enhanced the oxygen barrier performance, yielding a 99.8 % reduction in the oxygen transmission rate with that of pure PVA films. This remarkable improvement is attributed to the enhanced crystallinity, high aspect ratio, and superior exfoliation of the MoS2 nanosheets, which facilitate effective interactions with gas molecules and impede their movement. Furthermore, the PVA/MoS2-Ag-NCQDs nanocomposite films significantly improved ginger's preservation and nutritional integrity, thereby extending its shelf life. This study highlights the potential of MoS2-Ag-NCQD nanomaterials for improving oxygen barrier performance, advancing pharmaceutical applications, and enhancing ultraviolet shielding when used in food packaging systems.
期刊介绍:
Food packaging is crucial for preserving food integrity throughout the distribution chain. It safeguards against contamination by physical, chemical, and biological agents, ensuring the safety and quality of processed foods. The evolution of novel food packaging, including modified atmosphere and active packaging, has extended shelf life, enhancing convenience for consumers. Shelf life, the duration a perishable item remains suitable for sale, use, or consumption, is intricately linked with food packaging, emphasizing its role in maintaining product quality and safety.