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Applied Functional Materials
ISSN:2737-5323

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Vol.1, Iss.1, December 2021

Vol.1, Iss.1, December 2021

In this study, electron beam (E-beam) was used to deposit Ga₂O₃ films on the sapphire (Al₂O₃) substratest, then Ga₂O₃ films were divided three groups, unannealed, annealed at 850°C, and annealed at 950°C, respectively. After that, three different methods were investigated to find the optical energy bandgap of un-annealed and annealed Ga₂O₃ films. First was used n&k analyzer to measure all the optical energy bandgaps of un-annealed and annealed Ga₂O₃ films directly; Second, all the measured transmittance spectra of un-annealed and annealed Ga₂O₃ films, then the cut wavelength at the zero transmittance ratio of the extrapolated straight line according the slope of the absorption edge was used to measure optical energy bandgap using the equation of Eg= 12400/cut wavelength. Third, the curve of (αhν)² against the energy (hν) value was plotted according to Eqs. αhν = C (hν – Eg) ¹ ⁄ ²and T = (1 – R)² exp(-αd), and the extrapolated straight line was used to measure the optical energy bandgap of un-annealed or annealed Ga₂O₃ films. Finally, the measured results were well compared.
  • Open Access Editorial

    Introduction to a New Journal: Applied Functional Materials

    by Cheng-Fu Yang* and Zdeněk Remeš
    AFM 2021, Vol 1, Issue 1, 1-2, https://doi.org/10.35745/afm2021v01.01.0001 - Published on September 30, 2021

    Abstract

    The Applied Functional Materials is a peer-reviewed, open-access journal devoted to publishing research papers in the fields of materials engineering and technology. In a modern technological society, engineers and designers must work together with a variety of other professionals in their quest to find materials solutions to complex problems. Fast advances in material science and technology have broadened the horizons of material science whilst simultaneously creating a multitude of chal...

  • Open Access Article

    Synthesis and Characteristics of Sr3La(PO4)3:Eu3+ Phosphor with Luminescence in NIR Biological Window

    by Su-Hua Yang* and Wei-Jun Wang
    AFM 2021, Vol 1, Issue 1, 3-8, https://doi.org/10.35745/afm2021v01.01.0002 - Published on July 31, 2021

    Abstract

    The Sr3La(PO4)3:Eu3+ (SLP:Eu3+) phosphor was prepared with the coprecipitation method, which emited red visible-light along with a near-infrared (NIR) luminescence in the biological window region. The influence of synthesis temperature and Eu3+ doping concentration on the characteristics of the phosphor was discussed. The optimal crystallinity was obtained when the phosphor was doped with 0.7 mol% of Eu3+ and annealed at 1200 °C for 2 h. The particle size was approximately 1 μm. As compared with...

  • Open Access Article

    Silica as a Scaffold Layer via Electrospray for MAPbI3 Perovskite-based Solar Cell

    by Chun-Chih Hu, Ting-Yu Tai, Chi-Wei Chan and Yaw-Shyan Fu*
    AFM 2021, Vol 1, Issue 1, 9-24, https://doi.org/10.35745/afm2021v01.01.0003 - Published on July 31, 2021

    Abstract

    We synthesized a novel hybridized perovskite-silica (SiO2) solar cell using an electrospray process under ambient conditions. The Silica scaffold not only provided optical transmission from visible to infrared regions but also blocked the back flow transport of the holes and electrons to reach the electrodes, leading to reduced charge recombination. Moreover, the CH3NH3PbI3 (MAPbI3) film quality can be improved by using the combination of vacuum annealing enhanced crystal growth and the methylam...

  • Open Access Article

    Using Different Methods to Measure the Optical Energy Bandgap of Un-annealed and Annealed Ga2O3 Films

    by Ting-Yu Lin, Sang-Yuan Han, Cheng-Yi Huang, Cheng-Fu Yang* and Sufen Wei
    AFM 2021, Vol 1, Issue 1, 25-30, https://doi.org/10.35745/afm2021v01.01.0004 - Published on August 30, 2021

    Abstract

    In this study, electron beam (E-beam) was used to deposit Ga2O3 films on the sapphire (Al2O3) substratest, then Ga2O3 films were divided three groups, unannealed, annealed at 850 oC, and annealed at 950 oC, respectively. After that, three different methods were investigated to find the optical energy bandgap of un-annealed and annealed Ga2O3 films. First was used n&k analyzer to measure all the optical energy bandgaps of un-annealed and annealed Ga2O3 films directly; Second, all the measured tra...

  • Open Access Article

    Ultraviolet Light Exposure Effect on the Nanoscale Current-Voltage Characteristics of Bare and Silicate Nanoparticle Incorporated 3-aminopropyltrimethylsiloxane Films Deposited Using a Focus Ion Beam-Milled Atomic Force Microscopy Tip

    by Su-Yu Liao, Jheng-Jia Jhuang, Jing-Jenn Lin, Congo Tak-Shing Ching* and You-Lin Wu
    AFM 2021, Vol 1, Issue 1, 31-39, https://doi.org/10.35745/afm2021v01.01.0005 - Published on August 30, 2021

    Abstract

    Polysilicon wire (PSW) sensor with a sensing membrane of 3-aminopropyltrimethylsiloxan (γ-APTES) incorporated with polydimethylsiloxane (PDMS)-treated silica nanoparticles (NPs) (γ-APTES+NPs nanocomposite) deposited by a focus ion beam (FIB)-milled capillary atomic force microscopy (AFM) tip have been reported to have excellent biochemical sensing characteristics, and improved performance can be achieved after the sensing films being subjected to ultraviolet (UV) light illumination. While most o...

  • Open Access Article

    Isotherm Models and First-Principles Studies of Gas Adsorption in Graphene Field-Effect Transistors: A Review

    by Chenrong Gong, Ran Wang, Jia Liu, Xianjie Wan, Zhou Yu, Weihua Liu and Guohe Zhang*
    AFM 2021, Vol 1, Issue 1, 40-53, https://doi.org/10.35745/afm2021v01.01.0006 - Published on August 30, 2021

    Abstract

    Graphene has attracted a lot of attention in gas sensing applications for its high surface area ratio and unique chemical or physical gas adsorption ability. Being an important research method, theoretical calculations play a key role in both illustrating the gas sensing mechanism of graphene and improving the gas sensing performance of graphene-based sensors. This review discusses the application of adsorption isotherm theory and first-principles studies to graphene gas sensors. Different isoth...

  • Open Access Article

    Growth of ZnO Nanoflower Arrays on a Patterned Sapphire Substrate

    by Ching-Shan Wang, Fang-Hsing Wang* and Han-Wen Liu
    AFM 2021, Vol 1, Issue 1, 54-59, https://doi.org/10.35745/afm2021v01.01.0007 - Published on August 30, 2021

    Abstract

    In this study, we investigated a novel technology to grow the ZnO nanoflower arrays on a patterned sapphire substrate using hydrothermal method. The process to prepare the substrate and grow ZnO nanoflower arrays were that the patterned concave sapphire substrates were cleaned using acetone, isopropyl alcohol, and D.I. water in an ultrasonic cleaner. Al sacrificial layer with the thickness of 600 nm was deposited using a thermal evaporation technology. The sol-gel process was used to deposit the...