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RISS 인기검색어
- 검색키워드
- 저자 : Yunnan Fang (검색결과 2 건)
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Yunnan Fang,Manos M. Tentzeris 대한금속·재료학회 2024 ELECTRONIC MATERIALS LETTERS Vol.20 No.3
This work reports the fi rst demonstration that a chemoresistive sensor can be used to detect the aggregation pheromone offl our beetles. To prepare the sensing element of such a sensor, a novel functionalization method was developed to amplifyamine groups on the surface of carbon nanotubes (CNTs). Unlike traditional amine-amplifi cation approaches in which amplification effi ciency is signifi cantly reduced by self-crosslinking, the current amine amplifi cation process was self-crosslinkingfreedue to the use of a home-made compound in which amine groups were protected by Boc (tert-butyloxycarbonyl) protectinggroups and could be deprotected as needed. The inkjet ink formulated from the functionalized CNTs, together with anamine-rich compound and a commercial silver nanoparticle-based inkjet ink, was used to fabricate (via inkjet-printing anddrop-casting) lightweight, fl exible, and miniature-sized chemiresistive sensors for 4,8-dimethyldecanal (DMD), a compoundknown to be the aggregation pheromone of several species of fl our beetles. A home-built gas sensing system, including acommercial gas generator, a DMD permeation tube with its emission rate certifi ed, a data-acquisition system, and somehome-developed LabVIEW-based programs, was utilized to perform the DMD sensing trials. The sensors showed ultra-highsensitivity to synthetic aggregation pheromone DMD, as indicated by their prompt and signifi cant responses to 100 ppbDMD vapor. A mechanism for the sensitive sensing of DMD is proposed.
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Benjamin S. Cook,Yunnan Fang,Sangkil Kim,Taoran Le,W. Brandon Goodwin,Kenneth H. Sandhage,Manos M. Tentzeris 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.5
A scalable, low-cost process for fabricating copper-based microwave components on flexible, paper-based substrates is demonstrated. An inkjet printer is used to deposit a catalyst-bearing solution (tailored for such printing) in a desired pattern on commercially-available, recyclable, non-toxic (Teslin®) paper. The catalystbearing paper is then immersed in an aqueous copper-bearing solution to allow for electroless deposition of a compact and conformal layer of copper in the inkjet-derived pattern. Meander monopole antennas comprised of such electroless-deposited copper patterns on paper exhibited comparable performance as for antennas synthesized via inkjet printing of a commercially-available silver nanoparticle ink. However, the solution-based patterning and electroless copper deposition process avoids nozzle-clogging problems and costs associated with noble metal particle-based inks. This process yields compact conductive copper layers without appreciable oxidation and without the need for an elevated temperature, post-deposition thermal treatment commonly required for noble metal particle-based ink processes. This low-cost copper patterning process is readily scalable on virtually any substrate and may be used to generate a variety of copper-based microwave devices on flexible, paper-based substrates.
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