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無定形奈米碳管與多孔性氧化鋅/碳核-殼結構奈米柱陣列：新穎製程及於光感元...

國立高雄大學化學工程及材料工程學系碩士班

無定形奈米碳管與多孔性氧化鋅/碳核-殼結構奈米柱陣列：新穎製程及於光感元件之應用研究 = Amorphous Carbon Nanotubes and Porous ZnO/C Core-shell Nanorod Arrays：novel preparation and applications in photo-sensing devices

Record Type:	Language materials, printed : monographic
Paralel Title:	Amorphous Carbon Nanotubes and Porous ZnO/C Core-shell Nanorod Arrays：novel preparation and applications in photo-sensing devices
Author:	許嘉琦,
Secondary Intellectual Responsibility:	國立高雄大學
Place of Publication:	[高雄市]
Published:	撰者;
Year of Publication:	民99[2010]
Description:	96面圖，表 : 30公分;
Subject:	氧化鋅
Subject:	ZnO
Online resource:	http://handle.ncl.edu.tw/11296/ndltd/33483900352597641757
Summary:	本論文創新開發藉由沉積-蝕刻-蒸發(deposition-etching-evaporation)的機制成功合成無定形奈米碳管之有序陣列，其是先透過加熱丙酮乾式氣相製程於氧化鋅奈米柱陣列沉積碳層，再藉由丙酮加熱分解所產生的中間產物，促使核心的氧化鋅產生自發性的蝕刻及蒸發現象，因此利用丙酮於不同溫度下分解後，與核心的氧化鋅相互作用的程度，分別在基板溫度400℃~700℃合成無孔氧化鋅/碳核-殼奈米柱、多孔性氧化鋅/碳核-殼奈米柱，及無定形奈米碳管之有序陣列。接著，以掃描式電子顯微鏡與高解析穿透式電子顯微鏡可知隨著溫度升高碳殼厚度由3 nm增加至12 nm，而透過擇區繞射圖譜分析得知此無定形奈米碳管具有微弱的石墨結晶；而由拉曼光譜的分析顯示石墨sp2鍵結比例略高，故此無定形碳具有些微的石墨結構。再者，氧化鋅/碳核-殼奈米柱於紫外光光感測中，其明顯提升其光響應速度與光響應靈敏度（photoresponsivity），此外，此披覆碳殼於氧化鋅表面的改質策略明顯改善濕度對於其光感測的干擾。本研究不僅提出一個有效提升半導體材料於光感測的實際應用，並且可藉由改變氧化鋅的形貌，利用此獨特的合成機制製備可控制形貌之空心碳奈米材料。 Well-aligned amorphous carbon nanotube (a-CNT) arrays were fabricated for the first time by a proposed deposition-etching-evaporation (D.E.E.) route. The a-CNT arrays were prepared by deposition of carbon on the surface of well-aligned ZnO nanorod (NR) arrays by thermal decomposition of acetone followed by spontaneous etching and evaporation of core-ZnO. By utilizing the decomposition of acetone as well as distinct degrees of interaction between intermediate products and ZnO, well-aligned nonporous ZnO/C core-shell NR, porous ZnO/C core-shell NR, and a-CNT arrays were separately prepared by varying the working temperature from 400 to 700℃. Scanning electron microscopy and high-resolution transmission electron microscopy show the thickness of carbon shells increases from 3 to 12 nm with the increase in working temperature. Raman spectra demonstrate slight sp2 bonds of carbon, indicating small graphite regions embedded in amorphous carbon. Photoresponse measurements of ZnO/C NR arrays shows enhancement of both photoresponsivity and response velocity, and the interference of humidity with regard to photo-sensing is effectively reduced by the capping of carbon nanoshells. The work not only provides an effective route to improve the photo-sensing of semiconductor nanomaterials for practical applications, but also sheds light on preparing various hollow carbon nanostructures with distinct morphologies by employing the routes presented in the paper on diverse ZnO nanostructures for opto-electrochemical applications.

無定形奈米碳管與多孔性氧化鋅/碳核-殼結構奈米柱陣列：新穎製程及於光感元件之應用研究 = Amorphous Carbon Nanotubes and Porous ZnO/C Core-shell Nanorod Arrays：novel preparation and applications in photo-sensing devices
許, 嘉琦

無定形奈米碳管與多孔性氧化鋅/碳核-殼結構奈米柱陣列：新穎製程及於光感元件之應用研究 = Amorphous Carbon Nanotubes and Porous ZnO/C Core-shell Nanorod Arrays：novel preparation and applications in photo-sensing devices / 許嘉琦撰 - [高雄市] : 撰者, 民99[2010]. - 96面 ; 圖，表 ; 30公分.
參考書目：面.
氧化鋅ZnO

無定形奈米碳管與多孔性氧化鋅/碳核-殼結構奈米柱陣列：新穎製程及於光感元件之應用研究 = Amorphous Carbon Nanotubes and Porous ZnO/C Core-shell Nanorod Arrays：novel preparation and applications in photo-sensing devices
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330 $a 本論文創新開發藉由沉積-蝕刻-蒸發(deposition-etching-evaporation)的機制成功合成無定形奈米碳管之有序陣列，其是先透過加熱丙酮乾式氣相製程於氧化鋅奈米柱陣列沉積碳層，再藉由丙酮加熱分解所產生的中間產物，促使核心的氧化鋅產生自發性的蝕刻及蒸發現象，因此利用丙酮於不同溫度下分解後，與核心的氧化鋅相互作用的程度，分別在基板溫度400℃~700℃合成無孔氧化鋅/碳核-殼奈米柱、多孔性氧化鋅/碳核-殼奈米柱，及無定形奈米碳管之有序陣列。接著，以掃描式電子顯微鏡與高解析穿透式電子顯微鏡可知隨著溫度升高碳殼厚度由3 nm增加至12 nm，而透過擇區繞射圖譜分析得知此無定形奈米碳管具有微弱的石墨結晶；而由拉曼光譜的分析顯示石墨sp2鍵結比例略高，故此無定形碳具有些微的石墨結構。再者，氧化鋅/碳核-殼奈米柱於紫外光光感測中，其明顯提升其光響應速度與光響應靈敏度（photoresponsivity），此外，此披覆碳殼於氧化鋅表面的改質策略明顯改善濕度對於其光感測的干擾。本研究不僅提出一個有效提升半導體材料於光感測的實際應用，並且可藉由改變氧化鋅的形貌，利用此獨特的合成機制製備可控制形貌之空心碳奈米材料。 Well-aligned amorphous carbon nanotube (a-CNT) arrays were fabricated for the first time by a proposed deposition-etching-evaporation (D.E.E.) route. The a-CNT arrays were prepared by deposition of carbon on the surface of well-aligned ZnO nanorod (NR) arrays by thermal decomposition of acetone followed by spontaneous etching and evaporation of core-ZnO. By utilizing the decomposition of acetone as well as distinct degrees of interaction between intermediate products and ZnO, well-aligned nonporous ZnO/C core-shell NR, porous ZnO/C core-shell NR, and a-CNT arrays were separately prepared by varying the working temperature from 400 to 700℃. Scanning electron microscopy and high-resolution transmission electron microscopy show the thickness of carbon shells increases from 3 to 12 nm with the increase in working temperature. Raman spectra demonstrate slight sp2 bonds of carbon, indicating small graphite regions embedded in amorphous carbon. Photoresponse measurements of ZnO/C NR arrays shows enhancement of both photoresponsivity and response velocity, and the interference of humidity with regard to photo-sensing is effectively reduced by the capping of carbon nanoshells. The work not only provides an effective route to improve the photo-sensing of semiconductor nanomaterials for practical applications, but also sheds light on preparing various hollow carbon nanostructures with distinct morphologies by employing the routes presented in the paper on diverse ZnO nanostructures for opto-electrochemical applications.
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