We report an ultra-sensitive temperature sensor derived from graphene quantum dots (GQDs) embedded in a self-standing reduced graphene oxide (RGO) film.
Presently, the negative electrodes of lithium-ion batteries (LIBs) are constituted by carbon-based materials, which exhibit a limited specific capacity 372 mAh g−1 associated with the cycle in the composition between C and LiC6. Therefore, many efforts are currently made towards the technological development of nanostructured graphene materials because of their extraordinary mechanical, electrical, and electrochemical properties. Recent progress on advanced hybrids based on graphene oxide (GO) and reduced graphene oxide (rGO) has demonstrated the synergistic effects between graphene and an electroactive material (silicon, germanium, metal oxides (MOx)) as electrode for electrochemical devices. In this review, attention is focused on advanced materials based on GO and rGO and their composites used as anode materials for lithium-ion batteries.
The study investigates perceived challenges that pre-service teachers (henceforth refers to PSTs) majoring in an English Education Program of a state university in the Province of Gorontalo, Indonesia, experience in improving their English oral proficiency level. Data from the PSTs were collected mainly using individual semi-structured interviews, and then corroborated with the interview results collected from several lecturers who participated voluntarily. Informed by a thematic analysis approach, the study shows that the PSTs reported three main areas of challenges; linguistic proficiency, socio-culture, and English language engagement opportunity. Recommendations seeking to assist PSTs as well as the English Education Program in anticipating such challenges are also addressed.
Writing skill, among the four target language skills, is one of the skills that language learners need to master. In teaching this skill, therefore, teachers should take any effort to help learners write using the language they learn correctly. However, in the context of teaching English in Indonesia, particularly the writing skill, teachers often face challenges. The study reported in this article seeks to identify the challenges experienced by several Indonesian English language teachers in teaching English writing skills at VHS, a vocational high school, in Gorontalo, Indonesia. The participants involved were all English language teachers working at the school. Data were collected using interview and observation, and analyzed by using a thematic analysis method. The findings showed that there were four themes describing the teachers’ challenges in teaching English writing skills. They were teaching technique-related challenges, teaching time-related challenges, linguistics-related challenges, and learning motivation-related challenges. Even though the teachers are able to cope with the challenges, they still need to explore more strategies in teaching, thus the teaching and learning process can run effectively.
Mastering English facilitates students’ preparation for professional job applications. In the context of tourism school, learning the language, therefore, is a must. The study reported in this article explores the difficulties in speaking English encountered by a group of Indonesian learners of English and how they anticipated their perceived difficulties. A qualitative research approach was employed for data collection and analysis. Participants were from a Tourism Department of a university in the Province of Gorontalo, Indonesia, who voluntarily agreed to join in the interview sessions. Findings showed that most participants struggled to communicate in English, particularly when interacting with foreigners. The difficulties include a lack of vocabulary and comprehension of certain accents. In addition, it was found that in anticipating those difficulties, students employed regular English use practices, gestures, and information technology assistance. The study suggests that frequent meaningful English practices in and outside the English classroom should be facilitated, and the use of relevant technological tools for fostering English language practices be promoted.
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