The challenge of incorporating photothermal conversion function into chitosan (CS) hybrid fibers lies in balancing functionality and mechanical properties. In this study, we successfully prepared a chitosan/graphene oxide/gelatin (CS/GA/GO) hybrid fiber using the wet spinning process, achieving improved mechanical properties and efficient photothermal conversion capabilities. When compared with pure CS fiber with a breaking strength of 1.07 cN/dtex, the breaking strength of the CS/ GA composite fiber increased by 46.73%, while the CS/GA/GO hybrid fiber showed an even greater increase of 85.98%. In addition, the introduction of gelatin (GA) led to secondary scattering of near-infrared light, enhancing the photothermal conversion efficiency. As a result, the CS/GA/GO hybrid fiber exhibited a faster temperature rise rate and higher maximum temperatures (94.3 °C, 103.0 °C, and 111.3 °C) as compared to the CS/GO hybrid fiber. The successful incorporation of GA not only improved the mechanical properties but also enhanced the photothermal performance of the hybrid fiber.

Chitosangraphene oxidegelatin (CSGAGO) hybrid fiber with enhanced tensile strength and photothermal conversation efficiency
    Abstract
        Graphical abstract
    1 Introduction
    2 Experimental section
        2.1 The preparation of CSGAGO hybrid fiber
        2.2 Characterization methods
            2.2.1 Rheological property test
            2.2.2 Testing of mechanical properties
            2.2.3 Infrared spectral structure test
            2.2.4 Thermal weightlessness test
            2.2.5 Differential scanning calorimetry test
            2.2.6 X-ray diffractometry (XRD) text
            2.2.7 Contact angle test
            2.2.8 SEM test
            2.2.9 Infrared thermography test
    3 Results and discussion
        3.1 Rheological properties and Fourier infrared spectroscopy analysis
        3.2 The thermodynamic analysis
        3.3 Morphology and hydrophilicity analysis
        3.4 Fiber structure analysis
        3.5 Analysis of mechanical properties
        3.6 Photothermal conversation performance analysis
    4 Summary
    Acknowledgements 
    References

• Shangyin Jia(School of Textile and Materials Engineering, Dalian Polytechnic University, #1 Qinggongyuan, Ganjingzi, Dalian 116034, Liaoning, People’s Republic of China)
• Ying Han(School of Textile and Materials Engineering, Dalian Polytechnic University, #1 Qinggongyuan, Ganjingzi, Dalian 116034, Liaoning, People’s Republic of China)
• Zhihao Liu(School of Textile and Materials Engineering, Dalian Polytechnic University, #1 Qinggongyuan, Ganjingzi, Dalian 116034, Liaoning, People’s Republic of China)
• Jin Qiao(School of Textile and Materials Engineering, Dalian Polytechnic University, #1 Qinggongyuan, Ganjingzi, Dalian 116034, Liaoning, People’s Republic of China)
• Da Bao(School of Textile and Materials Engineering, Dalian Polytechnic University, #1 Qinggongyuan, Ganjingzi, Dalian 116034, Liaoning, People’s Republic of China)
• Linna Tian(School of Textile and Materials Engineering, Dalian Polytechnic University, #1 Qinggongyuan, Ganjingzi, Dalian 116034, Liaoning, People’s Republic of China)
• Bin Zhang(School of Textile and Materials Engineering, Dalian Polytechnic University, #1 Qinggongyuan, Ganjingzi, Dalian 116034, Liaoning, People’s Republic of China)
• Xiaohang Tuo(School of Textile and Materials Engineering, Dalian Polytechnic University, #1 Qinggongyuan, Ganjingzi, Dalian 116034, Liaoning, People’s Republic of China)
• Jing Guo(School of Textile and Materials Engineering, Dalian Polytechnic University, #1 Qinggongyuan, Ganjingzi, Dalian 116034, Liaoning, People’s Republic of China)
• Sen Zhang(School of Textile and Materials Engineering, Dalian Polytechnic University, #1 Qinggongyuan, Ganjingzi, Dalian 116034, Liaoning, People’s Republic of China, State Key Laboratory of Bio‑Fibers and Eco‑Textiles, Qingdao University, Qingdao 266071, People’s Republic of China) Corresponding author