Browsing by Author "Yang, Ting-Ting"

Now showing 1 - 5 of 5

Au-CdS Core-Shell Nanocrystals with Controllable Shell Thickness and Photoinduced Charge Separation Property
(2008-12-09)
Chen, Wei-Ta
;
Yang, Ting-Ting
;
Hsu, Yung-Jung
;
材料科學與工程學系
;
Department of Materials Science and Engineering
Au/ZnS core/shell nanocrystals as an efficient anode photocatalyst in direct methanol fuel cells
(2013)
Chen, Wei-Ta
;
Lin, Yin-Kai
;
Yang, Ting-Ting
;
Pu, Ying-Chih
;
Hsu, Yung-Jung
Au/ZnS core/shell nanocrystals with controllable shell thicknesses were synthesized using a cysteine-assisted hydrothermal method. Incorporating Au/ZnS nanocrystals into the traditional Pt-catalyzed half-cell reaction led to a 43.3% increase in methanol oxidation current under light illumination, demonstrating their promising potential for metal/semiconductor hybrid nanocrystals as the anode photocatalyst in direct methanol fuel cells.
Explore College Students\' Cognitive Processing during Scientific Literacy Online Assessments with the use of Eye Tracking Technology
(2015)
Tsai, Pei-Yi
;
Yang, Ting-Ting
;
She, Hsiao-Ching
;
教育研究所
;
Institute of Education
The present study was to explore undergraduate students\' performance and eye movement between two groups (non-science major and science major) on online scientific literacy assessments. The domain of scientific literacy in assessments consisted of identifying scientific questions, explaining phenomena scientifically, and using evidence scientifically. Eye-tracking system was synchronized to collect the indicator data of eye movement while students were engaging in cognitive processing during the assessments. The results showed that the science group students outperformed significantly than their peers in the non-science group on the assessments. Eye movement data further supported that the science group students allocated greater attention and made deeper cognitive processing at area of interest (AOI) on critical web pages compared to the non-science group ones. This study provides empirical evidence that the eye movement behaviors can give an insight into the information processing during scientific literacy online assessments.
Interfacial Charge Carrier Dynamics in Core-Shell Au-CdS Nanocrystals
(2010-07-08)
Yang, Ting-Ting
;
Chen, Wei-Ta
;
Hsu, Yung-Jung
;
Wei, Kung-Hwa
;
Lin, Tai-Yuan
The interfacial charge carrier dynamics for core-shell Au-CdS nanocrystals with various shell thicknesses were investigated and presented. Due to the difference in band structures between Au and CdS, a pronounced photoinduced charge separation took place at the interface of Au and CdS, resulting in the electron-charged Au core and the hole-enriched CdS shell. The electron-charging of Au core in Au-CdS nanocrystals was revealed with the corresponding XPS analysis and photocurrent measurement. Time-resolved PL spectra were measured to quantitatively analyze the electron transfer event between CdS shell and Au core for Au-CdS nanocrystals. An increase in the electron-transfer rate constant was observed for Au-CdS nanocrystals with increasing shell thickness, probably due to the less pronounced electron hole interaction of thicker CdS, which enabled a fuller extent of participation of photoexcited electrons in the charge separation process. On the other hand, the hole-enriched CdS shell of Au-CdS nanocrystals upon light illumination was characterized with a photocatalytic process. The photocatalytic activity of Au-CdS nanocrystals was found to increase with increasing shell thickness, attributable to the greater capability of light absorption achieved by the extensive growth of the CdS shell. The correlation of photocatalytic activity with the shell thickness of Au-CdS nanocrystals corresponded well with that of the electron-transfer rate constant. As compared to the relevant commercial products like N-doped P-25 TiO(2), and CdS powders, the as-synthesized Au-CdS nanocrystals,exhibited superior photocatalytic performance under visible light illumination, demonstrating their potential as an effective visible-light-driven photocatalyst. Furthermore, the result of performance evaluation under natural sunlight shows that the present Au-CdS nanocrystals can be used as highly efficient photocatalysts which may practically harvest energy from sunlight.
Leveraging College Students' Scientific Evidence-Based Reasoning Performance with Eye-Tracking-Supported Metacognition
(2019-12-01)
Tsai, Pei-Yi
;
Yang, Ting-Ting
;
She, Hsiao-Ching
;
Chen, Sheng-Chang
;
教育研究所
This study specifically focuses on examining whether the eye-tracking-supported metacognition would benefit science majors' and nonscience majors' scientific evidence-based reasoning performance. Thirty-nine science majors and forty-one nonscience majors were recruited to participate in an online scientific evidence-based reasoning task. Data regarding the students' online learning process and eye movement behaviors were simultaneously collected. The results indicated that the science majors not only significantly outperformed the nonscience majors in terms of reasoning performance but also allocated significantly greater eye movements during their first time of processing scientific evidence-based reasoning task. Immediately after the task, the eye-tracking-supported metacognition provided each student with individualized feedback regarding their eye movement behaviors, such as their eye fixation sequence, durations, and locations. With such immediate feedback, the students were provided an opportunity to engage in self-monitoring, evaluating, and calibrating their approaches in order to revise their final answers. After the application of this eye-tracking-supported metacognition, both the science majors and the nonscience majors all made significant improvements in their scientific evidence-based reasoning performance. However, no statistically significant differences in the reasoning performance or visual attention of the science majors and nonscience majors were found. This study demonstrated that the use of eye-tracking-supported metacognition was not only able to maximize the performance of both the science majors and nonscience majors but that it also bridged the gap in performance between the two groups.