2.1 Materials
TNT, RDX, and PETN were supplied from Hanwha Co. (Republic of Korea). Acetone was purchased from Aldrich Chemical Co. (USA). Stainless steel mesh (SSM) and polytetrafluoroethylene (PTFE) sheet (PFS) were supplied from Newone S&T (Republic of Korea). Cotton fabric (COF) was purchased from Chungoa Co. (Republic of Korea), lens cleansing paper (LCP) was purchased from Sargent-Welch Scientific Co. (USA), polypropylene (PP) nonwoven (PPN) was purchased from Thesoop Co. (Republic of Korea), acrylate fabric (APF), poly(ethylene terephthalate) (PET) fabric (PTF), and polyamide (PA) fabric (PAF) were purchased from Dawon Co. (Republic of Korea), carbon nonwoven (CFN) was purchased from GNT filter Co. (Republic of Korea), carbon plain/twilled fabrics (CPF and CTF, respectively) and carbon fabrics (CF720 and CF730) (CF2 and CF3, respectively) were purchased from Hankuk Carbon Co. (Republic of Korea), filter paper (FPP) was purchased from Hyundai Micro Co. (Republic of Korea), and coffee filter (CFP) was purchased from Thomas & Green Co. (Singapore). Only SSM is made of metal and has mesh structure. Collection matrices with woven fabric structures are PFS, COF, APF, PTF, PAF, CPF, CTF, CF2, and CF3, while those with nonwoven structures are LCP, PPN, CFN, FPP, and CFP (Table S1 and Figure S1; Supplementary Information).