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A simple synthesis of Ag2+xSe nanoparticles and their thin films for electronic device applications
Sunwook Kim,Duc Quy Vo,Dang Duc Dung,Sunglae Cho 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.1
A simple method to synthesize silver selenide nanoparticles has been proposed. By changing the ratio of Se-oleylamine complex and silver acetate in the reacting mixture at different temperatures, both size and stoichiometry of the silver selenide particles could be successfully controlled. The size of the nanoparticles was adjusted by changing reaction temperatures. The synthesized silver selenide nanoparticles showed size changes from 3 to 10 nm when the corresponding reaction temperatures were 40-100 oC, respectively. In addition to the size change, the stoichiometry of the synthesized nanoparticles (Ag2+xSe) could be adjusted by simply varying the ratio of Ag to Se precursors. Through XPS analyses the x value in Ag2+xSe was determined, and it changed between 0.54 and −0.03 by varying Ag/Se ratio from 2/0.75 to 2/4. The optical property of the nonstoichiometric Ag2+xSe nanoparticles was different from that of stoichiometric Ag2Se nanoparticles, but showed the plasmon absorption of Ag-Ag network. The plasmon absorption was decreased with the increased concentration of the Se precursor. Finally, the Ag2+xSe thin film in this work showed large magnetoresistance and successfully applied to prepare high-performance Schottky diode. The Ag2.06Se film exhibited the magnetoresistance effect up to 0.9% at only 0.8 T at room temperature. The voltage drop and breakdown voltage of the Schottky diode were 0.5 V and 9.3 V, respectively.
Piao, Yuanzhe The Korean Electrochemical Society 2012 Journal of electrochemical science and technology Vol.3 No.1
Highly ordered and perforated anodic aluminum oxide membranes were prepared by anodic oxidation and subsequent removal of the barrier layer. By using these homemade anodic aluminum oxide membranes as templates, metal selenide nanowires and nanotubes were synthesized. The structure and composition of these one-dimensional nanomaterials were studied by field emission scanning electron microscopy as well as transmission electron microscopy and energy dispersive X-ray spectroscopy. The growth process of metal selenide inside anodic aluminum oxide channel was traced by investigating the series of samples using scanning electron microscopy after reacting for different times. Straight and dense copper selenide and silver selenide nanowires with a uniform diameter were successfully prepared. In case of nickel selenide, nanotubes were preferentially formed. Phase and crystallinity of the nanostructured materials were also investigated.
Phase changeable silver selenide thin films fabricated by pulse electrodeposition
Boo Hyun An,Hye Min Ji,Jun-Hua Wu,Moon Kyu Cho,Ki-Yeon Yang,이헌,김영근 한국물리학회 2009 Current Applied Physics Vol.9 No.6
We have used a simple and direct method to successfully prepare Ag2Se thin films by pulse electrodeposition from a single aqueous solution of Ag and Se ions. The composition analysis confirms the stoichiometry and the morphological characterization shows that the thin films are dense and smooth. The films have the orthorhombic structure of regular Ag2Se materials at room temperature, while the electrical measurements reveal an interesting electrical behavior, similar to that of the Ag2Se nanowire arrays. The Ag2Se thin films were successfully deposited into polymer templates to form well-defined Ag2Se nanostructure, which provides a possibility to apply the method to high density, non-volatile memories based on phase change materials.
Phase changeable silver selenide thin films fabricated by pulse electrodeposition
An, B.H.,Ji, H.M.,Wu, J.H.,Cho, M.K.,Yang, K.Y.,Lee, H.,Kim, Y.K. Elsevier 2009 CURRENT APPLIED PHYSICS Vol.9 No.6
We have used a simple and direct method to successfully prepare Ag<SUB>2</SUB>Se thin films by pulse electrodeposition from a single aqueous solution of Ag and Se ions. The composition analysis confirms the stoichiometry and the morphological characterization shows that the thin films are dense and smooth. The films have the orthorhombic structure of regular Ag<SUB>2</SUB>Se materials at room temperature, while the electrical measurements reveal an interesting electrical behavior, similar to that of the Ag<SUB>2</SUB>Se nanowire arrays. The Ag<SUB>2</SUB>Se thin films were successfully deposited into polymer templates to form well-defined Ag<SUB>2</SUB>Se nanostructure, which provides a possibility to apply the method to high density, non-volatile memories based on phase change materials.
저온 열처리 공정에 따른 Ag₂Se 나노입자 박막의 열전특성
양승건(Seunggen Yang),조경아(Kyoungah Cho),윤정권(Junggwon Yun),최진용(Jinyong Choi),김상식(Sangsig Kim) 대한전기학회 2016 전기학회논문지 Vol.65 No.4
In this study, we synthesized Ag₂Se nanoparticles (NPs) in an aqueous solution and investigated the thermoelectric characteristics of Ag₂Se NPs thin films on plastic substrates. Regardless of thermal annealing treatment, all the Ag2Se NPs thin films show the negative Seebeck coefficients, indicating the n-type characteristics. As the annealing temperature increases, the electric conductivity increases while the Seebeck coefficient decreases. The electric conductivity of the thin film annealed at 180°C is larger by 106 times, compared with the as-prepared thin film, And the maximum power density for the thin film annealed at 180°C is calculated to be 44 μW/㎠.
박다빈,주현,김주헌 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.93 No.-
This paper presents inorganic/organic composites, namely, Ag2Se nanowire (NW)/polyvinylidenefluoride (PVDF)films, possessing outstanding thermoelectric power factor andflexibility. The compositefilm was fabricated through simple solution mixing and drop-casting with various contents of Ag2Se NW(50, 60, 70 and 80 wt.%). The Ag2Se NWs were synthesized with solution mixing with as-synthesized SeNWs. The Seebeck coefficient, electrical conductivity, and power factor of thefilms were valuated; thesample containing 70 wt.% Ag2Se NWs showed exceptional durability and enhanced thermoelectricpower factor. A maximum power factor of180.6 mW/m K2 was reached at 400 K. Thus, the proposedAg2Se NW/PVDFfilms could be used to realizeflexible inorganic/organic thermoelectric devices withgood conversion efficiency. In summary, we presented an efficient strategy for designing andsynthesizing high-performance inorganic/organic TE compositefilms by combining the high powerfactor of an inorganicfiller with the highflexibility of a polymer.