本研究論文成功地使用兩步驟的水熱法成長出奈米柱狀結構之氧化亞銅(Cu2O)，並藉由通入氮氣以獲得更高純度之氧化亞銅。利用XRD、SEM、TEM、UV-VIS測量其相組成、形貌、結晶取向及能隙。
我們也發現奈米柱狀氧化亞銅具有不同的應用並且量測其性質，包含：光觸媒、壓電特性、光電化學活性。通入30分鐘氮氣的試片具有最佳之光觸媒活性，因其氧化亞銅之純度最高。電流-電壓的量測也顯示氧化亞銅具有壓電性質：當施加越大的壓力，氧化亞銅的電流密度越高，此外，在相同壓力下，當照射可見光時，其電流密度也會提高。並發現壓光效應也可增加光觸媒活性。利用光電流來進行可靠度的測試，並顯示其強度約為3μA/cm2。

In this study, Cu2O nanorods were successfully fabricated using a two-step hydrothermal method. In addition, a N2 purging process was used to purify the content of Cu2O. The XRD, SEM, TEM, and UV-VIS characterization tools were applied to check the phases, morphologies, crystallinity, and band gap of Cu2O nanorods, respectively.
We found Cu2O nanorods can be applied to various promising applications, including photocatalysis, piezoresistive effects, and photoelectrochemical (PEC) activities. The sample after 30 mins N2 purging showed the best photodegradation efficiency because the highest purity of Cu2O was obtained, which exhibited the property of a direct energy band gap. The I-V characteristics showed the higher current density under higher pressures, indicating the piezoresistive effect. When a visible light was irradiated, the photo-induced piezoresistive effect was observed, which enhanced the photodegradation efficiency. The photocurrent of Cu2O nanorods was measured using a three-electrode configuration of a photoelectrochemical cell. Approximately 3μA/cm2 was observed and the signals were steady after the test of three runs and 8 cycles for each run.

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