Chemical vapor deposition of graphene on transition metals is the most favored method to get large scale homogenous graphene films to date. However, this method involves a very critical step of transferring as grown graphene to desired substrates. A sacrificial polymer film is used to provide mechanical and structural support to graphene, as it is detached from underlying metal substrate, but, the residue and cracks of the polymer film after the transfer process affects the properties of the graphene. Herein, a simple mixture of polystyrene and low weight plasticizing molecules is reported as a suitable candidate to be used as polymer support layer for transfer of graphene synthesized by chemical vapor deposition (CVD). This combination primarily improves the flexibility of the polystyrene to prevent cracking during the transfer process. In addition, the polymer removal solvent can easily penetrate between the softener molecules, so that the polymer film can be easily dissolved after transfer of graphene, thereby leaving no residue. This facile method can be used freely for the large-scale transfer of 2D materials.
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http://dx.doi.org/10.3390/polym12081839 | DOI Listing |
Mikrochim Acta
December 2024
School of Materials and Chemical Engineering, Fuzhou Institute of Oceanography, Minjiang University, Fuzhou, Fujian, 350108, China.
Silver nanowire (Ag NW)/gold nanosphere (Au NS) binary plasma films were prepared using plasma coupling between Ag NWs and Au NSs. The plasma films formed by combining these two noble metals showed better sensitivity for SERS detection with a minimum detection concentration of 10 M for R6G compared to pure Ag NWs or Au NSs. After rational optimisation of the substrate preparation process, the substrate showed good homogeneity, reproducibility and stability.
View Article and Find Full Text PDFACS Appl Mater Interfaces
December 2024
Department of Applied Physics, Hebei University of Technology, Tianjin 300401, PR China.
Actuators based on liquid crystals have garnered significant attention due to their potential applications in wearable technology and bionic soft robots. Composite films composed of liquid crystal polymer networks (LCNs) and other stimulus-responsive materials exhibit the capability to convert external stimuli into mechanical deformation. However, the development of sunlight-driven actuators presents significant challenges, primarily due to the relatively low intensity of sunlight and the limited conversion efficiency of photothermal materials.
View Article and Find Full Text PDFEur J Pharm Sci
December 2024
Department of Pharmaceutical Technology, Faculty of Pharmacy, Medical University of Gdansk, Poland.
Adhesiveness of dermal patches can be modified in the presence of active substances. The effect is more complex when liquid components are also present in the matrix. Commercial grade pressure sensitive adhesive (PSA) polyacrylates (three types) and silicones (two types) were used to prepare adhesive matrices and liquid additives were propylene glycol, polyoxyethylene glycol, isopropyl myristate, triacetin, triethyl citrate or low viscosity silicone oil.
View Article and Find Full Text PDFInt J Biol Macromol
December 2024
Key Laboratory of Dairy Science, Ministry of Education, College of Food Science, Northeast Agricultural University, Harbin 150030, China. Electronic address:
Food packaging plays a vital role in guaranteeing the quality and safety of fresh products during the storage and distribution. Carboxymethyl chitosan (CMCS) is identified as a promising polymer for food packaging film owing to its film-forming ability, non-toxicity, and biodegradability. Nevertheless, the practical applications of pure CMCS film usually suffer from some limits owing to its poor antibacterial effect and mechanical strength.
View Article and Find Full Text PDFInt J Biol Macromol
December 2024
Center of Radiation Processing for Polymer Modification and Nanotechnology (CRPN), Department of Materials Science, Faculty of Science, Kasetsart University, 50 Ngam Wong Wan Rd., Ladyao, Chatuchak, Bangkok 10900, Thailand; Department of Materials Science, Faculty of Science, Kasetsart University, 50 Ngam Wong Wan Rd., Ladyao, Chatuchak, Bangkok 10900, Thailand. Electronic address:
Cyclic amine-multibranched poly(lactic acid) (mPLA) was prepared as a dual antioxidant and antimicrobial toward PLA active packaging for food shelf-life extension in a case study of bread. The mPLA was coupled with piperidine (PPR) containing a heterocyclic amine derivative, which is a nature-rich bioactive function. The functions of mPLA-PPR enhancing the PLA film performance were studied in comparison with PPR, mPLA and Tinuvin® 770.
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