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A novel inorganic nonmetallic material boron carbide (B4C) was applied in paper spray ionization to analyze organic molecules in both negative and positive modes. The utilization of B4C has led to a notable enhancement in signal responses for various molecules, including bisphenols and drugs, by approximately two to four times. The limit of detection (LOD) of bisphenol AF and nilotinib standard solutions can reach 1 and 0.5 μg/mL, respectively. Moreover, linear relationships for bisphenol AF was established within the concentration range of 1–100 μg/mL, exhibiting strong correlation coefficients. Recovery experiments for BPAF in water samples from the inlet and outlet of a sewage treatment plant, conducted without any pretreatment, achieved a maximum recovery rate of 98.8% and an RSD below 9.78%. [ABSTRACT FROM AUTHOR]

Conductive polymer composites are highly demanded for practical application in electromagnetic interference shielding and Joule heating owing to their excellent flexibility and adjustable conductivity. Herein, a thin film with a gradient structure, comprising carbon nanotube/castor oil‐based waterborne polyurethane (CNT/WPU), has been fabricated through solution mixing utilizing casting technology. Scanning electron microscopy images confirm that CNTs are enriched at the top of the obtained CNT/WPU film, leading to a low resistance value. Consequently, the resultant gradient CNT/WPU films exhibit shielding effectiveness, specific shielding effectiveness, and an absorption coefficient of 22.8 dB, 1091 dB/cm, and 0.697, respectively, indicating a predominance of absorption in the shielding capacity. The temperature at the surface of the resultant gradient CNT/WPU film reaches ~77°C at a voltage of 20 V. The film with a CNT content of 14.1 wt% exhibits a good stress of 11.7 MPa and a high module of 39.9 MPa. Therefore, the obtained CNT/WPU films can be applied as thin shielding materials or coating. Highlights: Fabricating a gradient CNT/castor oil–based waterborne polyurethane films.Exhibiting shielding effectiveness of 22.8 dB and A‐value of 0.697.Steady‐state temperature of CNT/WPU reaches 77°C at 20 V.Possessing green EMI shielding capability. [ABSTRACT FROM AUTHOR]

Multifunctional polymer-based electromagnetic interference (EMI) shielding foams are attracting considerable attention owing to their ability to mitigate increasing electromagnetic-wave pollution. However, developing robust foams with excellent EMI shielding capabilities and superior thermal insulation properties remains challenging. Herein, CoFe2O4@carbon nanotube/polydimethylsiloxane/expandable polymer microsphere (CFO@CPE) foams were successfully prepared using a combination procedure involving solution mixing, freeze-drying, and hot-press molding. The synergistic effect of the porous structure and segregated magnetic/conductive network enabled the CFO@CPE foam to exhibit a shielding effectiveness of 48.85 dB and a low thermal conductivity of 0.106 W/(m·K). In addition, the impact and compressive strengths of the obtained foams reached 3.78 kJ/m2 and 8.17 MPa, respectively. These features support the application of the resultant foam as an EMI shielding material in complex practical situations. [ABSTRACT FROM AUTHOR]

Two-dimensional transition metal dichalcogenides (TMDs) are a new type of two-dimensional materials after graphene. Due to their unique physical and chemical properties, much attention has been attracted in semiconductors, optoelectronic materials, energy storage, and catalytic hydrogen production. Chemical vapor deposition (CVD) is currently one of the processes suitable for realizing large-scale preparation of two-dimensional materials. Due to the highly controllable parameters of CVD process, it has great advantages in the preparation of two-dimension materials. In this paper, the recent research progress on preparation of TMDs by CVD is reviewed, and the influence of various factors on the growth and final morphology of the products in CVD preparation process, including precursors, temperature, substrate, auxiliaries, pressure and carrier gas are discussed. Some improved CVD processes are listed and their characteristics are also summarized. Finally, challenges and prospects for the development of TMDs prepared by CVD are discussed. [ABSTRACT FROM AUTHOR]