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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 廖尉斯(Wei-Ssu Liao) | |
dc.contributor.author | Yi-Ching Li | en |
dc.contributor.author | 李怡靜 | zh_TW |
dc.date.accessioned | 2021-07-11T14:42:55Z | - |
dc.date.available | 2021-10-14 | |
dc.date.copyright | 2016-10-14 | |
dc.date.issued | 2016 | |
dc.date.submitted | 2016-08-15 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/78122 | - |
dc.description.abstract | Direct metal nanoparticle growth over different types of polymer surfaces is demonstrated. The polymer top layer is activated by oxygen plasma to initiate free radical induced metal ion reduction at the solid-liquid interface. Excited gas molecules attack polymer surface moieties and generate activated free radical sites. These spots provide reducing power to reduce metal ions or the split of water molecules into hydroxyl radicals. The generated hydroxyl radicals thereafter induce continuous reduction of metal ions at the solid‑liquid interface. The growth of nanoparticles depends on polymer composition, surface treatment, and solution environments. Governed by initial radical generation, metal reduction proceeds, slows down, and could reach a mono-dispersed nanoparticle single layer by tuning experimental conditions. The particles anchor with polymers and exhibit durable entangled geometries much different from products of deposition or electrostatic adhesion. This highly enriched metal-polymer interface binding strength enables a material bridge and opens a straightforward route to integrate conventionally discrete surfaces. | en |
dc.description.provenance | Made available in DSpace on 2021-07-11T14:42:55Z (GMT). No. of bitstreams: 1 ntu-105-R03223170-1.pdf: 3195552 bytes, checksum: b91e82e7bcb9cc7ebeefb201dd613d0a (MD5) Previous issue date: 2016 | en |
dc.description.tableofcontents | Contents
致謝....................................................................................................i 摘要....................................................................................................ii Abstract ....................................................................................................iii List of Figure..............................................................................................vi List of Scheme......................................................................................viii Chapter 1 Introduction...............................................................................1 Chapter 2 Experimental............................................................................9 2.1 Materials..........................................................................................9 2.2 Silver nanoparticles / polymer film fabrication............................................10 2.3 DPPH radical scavenging assay.......................................................11 2.4 EPR spectra measurements.............................................................11 2.5 Antimicrobial PET film tests...........................................................12 Chapter 3 Results and Discussion...............................................................13 3.1 Mechanism of reducing silver ions onto plasma-activated surfaces..............................................................................................15 3.2 The influence of plasma species in silver nanoparticles formation..............................................................................................18 3.3 The solvent effect on silver nanoparticle nucleation and growth...............................................................................................20 3.4 The influence of oxygen plasma treatment time on silver nanoparticle growth............................................................................................................22 3.5 The influence of solution parameters.....................................................24 3.6 The effect of polymer types on nanoparticle growth.........................................27 3.7 Antimicrobial polymer films.................................................................30 Chapter 4 Conclusion...................................................................................32 Reference...........................................................................................33 List of Figures Figure 1. (A) UV-vis absorption spectra of PET films with (red) or without (black) 15s of O2 plasma treatment before immersing in the silver nitrate solution. The scale bar is 2 cm. (B) SEM image of the silver nanoparticle/PET substrate. The scale bar is 50 nm (C) The cross-section TEM image of the silver nanoparticle/PET substrate interfaces. The scale bar is 5 nm............................................................................................15 Figure 2. The change of radical sensitive DPPH solution (0.05 mM) absorption (at 519 nm) when encounter polymer substrates without (blue column) and with (red column) the oxygen plasma treatment. (a) 0.05 mM DPPH solution; (b) Cellulose; (c) PET; (d) PP. (B) The radical signal of EPR peak on oxygen plasma treatment and without oxygen plasma treatment. The red line shows the radical signal of PET film treated with oxygen plasma for 15-s, and the black line shows the radical signal of PET film without oxygen plasma treatment. (N=3)....................................................................................18 Figure 3. (A) UV-vis absorption spectra of PET films under different plasma treatment but the same silver nitrate solution immersion (20 mM, 24 hours) conditions. Red line: 15 seconds oxygen plasma. Blue line: 15 seconds air plasma. Black line: No plasma treatment. Olive line: 15 seconds argon plasma. Orange line: 4 minute argon plasma. Pink line: 8 minute argon plasma. The inset photo image shows different PET films carried out under different plasma species for 15-s plasma treatment. From left to right show oxygen plasma, air plasma, argon plasma and without plasma treatment. The scale bar is 1 cm. (B) UV-vis absorption spectra of PET substrates treated with 15 s oxygen plasma and immersed into 20 mM silver nitrate solution for 3 hours. The silver nitrate solutions are prepared with different solvent: water (red line) and methanol (blue line), while the corresponding controls, i.e. films without oxygen plasma treatments are presented as green and black lines, respectively................................................................21 Figure 4. The influence of the oxygen plasma treatment time on silver nanoparticle growth on PET and PP films. The films are all immersed in 100 mM silver nitrate solution at 70 °C for 24 hr. (N=3)................................................................................23 Figure 5. The growth of silver nanoparticles on PET polymer films under different conditions. All the PET films are treated with 15 s oxygen plasma (18 W, with constant O2 flow of 0.45 mbar). (A) The change of PET film absorbance at 420 nm under different silver nitrate solution incubation time at 70 °C. (B) The change of PET film absorbance at 420 nm under different silver nitrate solution concentration with 3 hours of incubation. (C) The change of PET film absorbance at 420 nm under different incubation temperature within the use of 20 mM silver nitrate solution.................................................26 Figure 6. Tests of different polymers under this plasma treatment induced silver nanoparticle growth...............................................................................29 Figure 7. The antimicrobial Ag/PET film tests over two different types of bacterial: (a) E coli. and (b) S. aureus. The yellow and blue rectangles indicate the positions of PET films without and with silver nanoparticles on top of Luria–Bertani (LB) medium broth, respectively. The polymer film is 1 cm x 1 cm......................................................31 List of Schemes Scheme 1. The schematic illustration of silanization process and introducing metal nanoparticles on the substrate surface. (A) steps involved of modification in silanization process. (B) introducing metal nanoparticles on the silanized surface........................2 Scheme 2. The schematic illustration of immobilization of metal nanoparticles by the sol- gel process. (A) Reaction process involved in the sol-gel process. (B) Modification of grafted molecule on the substrate surface and immobilization of metal nanoparticles on the substrate surface.................................................................................3 Scheme 3. The schematic illustration of immobilization of (A) negatively and (B) positively charge metal nanoparticles by Layer-by-Layer process.............................4 Scheme 4. The schematic illustration of cooperative electrostatic absorption. (a) Negatively-charged metal nanoparticles do not absorb onto the oxidized substrate surface. (b) Positively metal nanoparticles slightly absorb onto the oxidized substrate surface, due to the repulsion force between nanoparticles. (c) Mixtures of negatively and positively- charged metal nanoparticles absorb onto the substrate surface by cooperative electrostatic absorption. ...........................................................................................5 Scheme 5. The schematic illustrates the process of Tollen’s reaction and the below SEM image shows the silicon rubber before (left) and after (right) formaldehyde plasma treatment and Tollen’s reaction....................................................................7 Scheme 6. The schematic illustration of the peeling-off process in reduction of metal nanoparticles. Process of peeling-off and metal nanoparticles reduction on the tape surface.................................................................................................7 Scheme 7. The schematic illustration of the silver nanoparticle reduction over polymer surfaces.........................................................................................13 | |
dc.language.iso | en | |
dc.title | 利用活化聚合物基材表面直接生成金屬奈米粒子 | zh_TW |
dc.title | Direct Growth of Metal Nanoparticles on Polymer Surfaces | en |
dc.type | Thesis | |
dc.date.schoolyear | 104-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 王宗興(Tsung-Shing Wang),陳浩銘(Hao-Ming Chen),戴桓青(Hwan-Ching Tai),詹益慈(Yi-Tsu Chan) | |
dc.subject.keyword | 金屬奈米粒子,聚合物表面,氧氣電漿,表面自由基,非吸附性鍵結, | zh_TW |
dc.subject.keyword | Metal nanoparticles,Polymer surface,Oxygen plasma,Radical reduction,in situ reduction, | en |
dc.relation.page | 35 | |
dc.identifier.doi | 10.6342/NTU201602379 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2016-08-16 | |
dc.contributor.author-college | 理學院 | zh_TW |
dc.contributor.author-dept | 化學研究所 | zh_TW |
顯示於系所單位: | 化學系 |
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