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The photoinduced stiffening (PIS) and photoplastic effect (PPE) of ZnS individual nanobelt (NB) were observed by using a nanoindenter in conjunction with an incident ultraviolet (UV) light source system. The results show that the elastic modulus and hardness of ZnS individual NB under UV illumination are at least 32% and 20% larger than those in darkness. The mechanisms of PIS and PPE are interpreted by the increase in electronic strain and Peierls barrier due to the photogeneration of free carriers in ZnS individual NB. The research may offer useful guidelines to the application of optoelectronic devices based on individual nanostructures.

Abstract-Natural fibers are used to improve mechanical properties of composites materials; research into the influence of the mechanical properties of various fibers' cell walls on the mechanical properties of composites is very important for producing highquality composites. The aim of this research is to study the influence of the mechanical properties of tobacco stalk fiber cell wall on the mechanical properties of particle-based panels, comparing the properties of particleboards made with tobacco stalks from different parts of the stem (bottom, midpoint, and top) and treated tobacco stalks from the midpoint of the stem with 1% NaOH solution at 100℃ for 0, 30, 60, and 90 mins, respectively. The results show that the mechanical properties of tobacco stalk fiber cell walls from different parts of the stalk differ and are reduced after the tobacco stalk is treated with 1% NaOH solution. The mechanical properties of the tobacco stalk-based particleboard panels were negatively correlated with the mechanical properties of the tobacco stalk fiber cell wall. After the 1% NaOH treatments of 0-60 min, the middle lamellae were broken, and the mechanical properties of the particleboard were improved; after the 1% NaOH treatment of 90 min, the fiber cell walls were broken and the MOR and MOE of the panels were reduced. Thus, it was concluded that the mechanical properties of fiber cell wall can be reduced to improve the mechanical properties of particleboard panels. The improvement of the mechanical properties of particleboard with no-added-Formaldehyde resin by reducing the mechanical properties of fiber cell wall will be studied in future.

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