Seminar Rebon 02 Juni 2021 oleh Ir. Rahmat Hidayat, S.T., M.Sc.IT dari Politeknik Negeri Padang
Pos oleh :
dep_fisika
Fika Fauzi, Aditya Rianjanu, Iman Santoso, Kuwat Triyana
https://doi.org/10.1016/j.sna.2021.112837
Journal : Sensors and Actuators A: Physical
Volume 330, 15 October 2021, 112837
Abstract
Graphene and graphene-based materials have shown great potential for detecting gases and humidity due to their high specific surface areas. Quartz crystal microbalance (QCM) sensors have been massively developed because they have high sensitivity, consume low energy, and can be readily modified. Recently, QCM coated by graphene composites has been explored to sensitively and selectively detect various gases and humidity. Herein, we summarize the recent progress on QCM gas sensors and QCM humidity sensors based on graphene materials and graphene composites. We start from an introduction to the sensing principle of QCM, synthesis and preparation of graphene materials used for QCM sensing material, application of graphene materials and graphene composites for sensing materials of QCM gas sensors and humidity sensors, and the mechanism of those sensors. We mainly summarize the recent advances in the performances of QCM gas sensor and QCM humidity sensor coated with pristine graphene, graphene oxide, reduced graphene oxide, and various graphene-based composite materials, including chemical, polymer, metal oxide, and other carbon-based materials. The challenges for future works related to the development of QCM sensors coated by graphene materials or graphene composites are also elaborated.
Di saat pandemi ini,
Jemari tak sempat berjabat,
Wajah tak bisa bertatap,
Untuk lisan yang tak terjaga,
Jika ada sikap yang membakar lara,
Jika ada janji yang tak tertunaikan,
dan untuk hati yang yang berprasangka,
Semoga pintu maaf masih terbuka.
Halo! Kamu! Iya, kamu yang masih kuliah S1!
PENDAFTARAN CALON MAHASISWA MAGISTER FISIKA (Jalur Reguler dan Jalur Penelitian/Riset)
PERSYARATAN UMUM (untuk Jalur Reguler & Jalur Penelitian/Riset/by Research)
Departemen Fisika menerima pendaftaran mahasiswa Magister Fisika baik jalur reguler dan jalur penelitian (by research). Semua proses pendaftaran baik jalur reguler maupun jalur penelitian dilakukan melalui laman https://um.ugm.ac.id/prosedur-pendaftaran-magister/
Seminar Rebon 05 Mei 2021 oleh Dr. T. Marwan Irnaka, M.Sc.
Seminar Rebon 28 April 2021 oleh Dr. Eng. Anjar Taufik Hidayat
Aditya Rianjanu, Eka Nurfani, Muhamad F. Arif, Kuwat Triyana, Hutomo Suryo Wasisto
https://doi.org/10.1016/j.mtcomm.2020.101770
Journal : Materials Today Communications
Abstract
Stability is one of the crucial sensor properties to be applicable in real condition and yet hardly investigated. In this communication, we evaluated the stability of butanol vapor sensors that were constructed using quartz crystal microbalance (QCM) platforms coated with electrospun polyvinyl acetate (PVAc) nanofibers. The reliability test was performed by monitoring the sensor frequency characteristics in a long-term measurement, in which the frequency shift was found to decrease by ∼7% after the sensors have been tested for 100 times. This performance degradation was mainly attributed to the reduction of active membrane surface area caused by swelling of the nanofibers, which was confirmed by scanning electron microscopy (SEM) images. This finding does not only allow us to better understand the nanofiber-coated QCM sensor limitation and degradation process, but also to design appropriate strategies for mitigating the device stability issues.
Nursidik Yulianto, Andam Deatama Refino, Alina Syring, Nurhalis Majid, Shinta Mariana, Patrick Schnell, Ruri Agung Wahyuono, Kuwat Triyana, Florian Meierhofer, Winfried Daum, Fatwa F. Abdi, Tobias Voss, Hutomo Suryo Wasisto & Andreas Waag
https://doi.org/10.1038/s41378-021-00257-y
Journal : Nature Microsystems & Nanoengineering
Abstract
The integration of gallium nitride (GaN) nanowire light-emitting diodes (nanoLEDs) on flexible substrates offers opportunities for applications beyond rigid solid-state lighting (e.g., for wearable optoelectronics and bendable inorganic displays). Here, we report on a fast physical transfer route based on femtosecond laser lift-off (fs-LLO) to realize wafer-scale top–down GaN nanoLED arrays on unconventional platforms. Combined with photolithography and hybrid etching processes, we successfully transferred GaN blue nanoLEDs from a full two-inch sapphire substrate onto a flexible copper (Cu) foil with a high nanowire density (~107 wires/cm2), transfer yield (~99.5%), and reproducibility. Various nanoanalytical measurements were conducted to evaluate the performance and limitations of the fs-LLO technique as well as to gain insights into physical material properties such as strain relaxation and assess the maturity of the transfer process. This work could enable the easy recycling of native growth substrates and inspire the development of large-scale hybrid GaN nanowire optoelectronic devices by solely employing standard epitaxial LED wafers (i.e., customized LED wafers with additional embedded sacrificial materials and a complicated growth process are not required).