Meizhen Guo,Meiyu Song,Shanshan Li,Zhilei Yin,Xinyu Song,Yuxiang Bu
Developing a green and economical synthetic strategy for ZnS nanotubes is of great interest. In this work, ZnS nanotubes are successfully fabricated using only three raw materials (Zn(CH3COO)2, NaHCO3 and Na2S) through a simple two step synthetic route at ambient temperature. It is worth noting that the process is economical and environmentally friendly, without the need for high pressure or elevated temperature conditions. Interestingly, a very obvious feature is the existence of abundant sulfur surface defects on the as-prepared ZnS nanotubes, which not only produces strong defect-related fluorescence properties, but also leads to abundant water adsorbed on the surface of zinc sulfide. Furthermore, the as-prepared ZnS nanotubes as an adsorbent are exploited in the adsorption of organic dyes. Notably, the resultant products display superior selective adsorption ability for anionic dyes with amine (–NH2/NH) functional groups over a wide pH range through the synergistic effect of hydrogen bonding and electrostatic attraction between the dye molecules and the adsorbent. Taking CR dye as an example, the maximum adsorption capacity for the removal of Congo red reaches 724.6 mg g−1 in water, much higher than many composite adsorbents reported in the literature. Thus, the present study not only presents a promising strategy for fabrication of ZnS nanotubes but also indicates their great potential application as environmentally friendly adsorbents in organic dye separation technologies or dye removal.
Xiaolong Li,Yulu Tang,Jundi Wan,Yahui Zhang,Dongjun Lv,Mingyuan Guo,Yongning Ma,Yuhao Yang
UV–vis–NIR photodetectors are of great importance to extensive applications, while they are limited by the low photon utilization and narrow light response range inherent in a single material. To overcome these limitations, we propose the construction of heterojunction photosensitive materials featuring a hollow structure. In this study, Y-type titanylphthalocyanine nanoparticles (Y-TiOPc NPs) and hollow ZnS nanotubes (ZnS NTs) are employed to fabricate a bulk heterojunction photosensitive material (Y-TiOPc NPs:ZnS NTs). This composite material exhibits a significant cavity enhancement effect, resulting from multiple light reflections and outstanding light absorption spanning from 365 to 1060 nm. The photodetector based on Y-TiOPc NPs:ZnS NTs (referred to as Y:ZT-PD) demonstrates remarkable photodetection capabilities, including photomultiplication phenomena. Specifically, it achieves a high external quantum efficiency of 24042%, an impressive photoresponsivity (R) of 101967 mA/W, and an excellent specific detectivity (D*) of 1.56 × 1012 Jones at 0.01 mW/cm2. Additionally, the multiperiod time-resolved photocurrent response curves exhibit rapid and stable responses across different wavelengths. Characterization results indicate that these exceptional performances primarily arise from the cavity enhancement effect of ZnS NTs and the hole-injection effect resulting from interfacial trapped electrons. Consequently, the outstanding performance, coupled with the broad spectral range and stability, positions the hollow bulk heterojunction as a promising material for the next generation of broadband photodetectors.
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