Ainun Rahmahwati Ainuddin

Growth of ZnO on Flexible Substrate via Sol-Gel Hot Water Treatment

Sol-gel precursor has been prepared by using zinc acetate (ZnAC) as starting material dissolved in isopropanol (IPA), diethanolamine (DEA) and distilled water (H2O) were added to produce a homogeneous and stable solution. The sol-gel precursor was deposited on ITO/PET substrate by spin-coat route. Oxidation process was held in deionized water at 90 °C for a specific time. The (100) and (101) ZnO planes were formed as the preferred orientation. RMS values of ZnO samples found to be 280 nm, 272 nm and 241 nm for 8 h, 12 h and 16 h, respectively by hot water treatment (HWT). ZnO nanorods-hourglass-like, nanosheet-leafs-like and nanorods-oval-like were obtained with different HWT time.

Synthesis of carbon nanostructures from high density polyethylene (HDPE) and polyethylene terephthalate (PET) waste by chemical vapour deposition

In this study, carbon nanostructures were synthesized from High Density Polyethylene (HDPE) and Polyethylene terephthalate (PET) waste by single-stage chemical vapour deposition (CVD) method. In CVD, iron was used as catalyst and pyrolitic of carbon source was conducted at temperature 700, 800 and 900oC for 30 minutes. Argon gas was used as carrier gas with flow at 90 sccm. The synthesized carbon nanostructures were characterized by FESEM, EDS and calculation of carbon yield (%). FESEM micrograph shows that the carbon nanostructures were only grown as nanofilament when synthesized from PET waste. The synthesization of carbon nanostructure at 700oC was produced smooth and the smallest diameter nanofilament compared to others. The carbon yield of synthesized carbon nanostructures from PET was lower from HDPE. Furthermore, the carbon yield is recorded to increase with increasing of reaction temperature for all samples. Elemental study by EDS analysis were carried out and the formation of carbon nanostructures was confirmed after CVD process. Utilization of polymer waste to produce carbon nanostructures is beneficial to ensure that the carbon nanotechnology will be sustained in future.

Characterization of ZnO nanostructure synthesized through hydrothermal method

ZnO nanostructures can be derived using a variety of techniques. Hydrothermal synthesis of ZnO nanostructures can be produced easily on a large scale at low temperature. Among the factors that influence the crystallinity of ZnO nanostructures are types of alkaline solution, the alkaline pH value used and the duration of the hydrothermal process. This research focuses on the fabricated of ZnO nanostructures via hydrothermal synthesis and the effects of alkaline solution on the morphology of ZnO nanostructures. Distilled water was mixed with three types of alkaline which are NaOH, KOH and LiOH solutions in three different pH values. The hydrothermal process was conducted using three different time which are 6, 12 and 24 hours. XRD analysis was carried out to identify the phase and crystallinity of ZnO nanostructures. Morphology and surface roughness analysis were characterized using FESEM and AFM to observe the nanostructures growth on ZnO thin films. All of these analyses were performed on the growth of Zn...

Studies on modification of ZnO sol-gel spin coated on flexible substrate at low temperature: Effect of time exposure

Transparent Conducting Oxide (TCO) Film has been chosen as flexible substrate recently in the application of a device. One of the TCO mostly used is ITO/PET substrates. Through this communication, the effect of time exposure of ZnO thin film by modified sol-gel deposited on flexible substrates was investigated. 0.75 M of NaOH and C6H8O7 were dropped directly into precursor solution right before aging process in order to modified precursor solution environment condition. x-ray diffraction pattern recorded plane (100) and (101) as preferential growth orientation. The (101) plane was selected to calculate the average crystallite. The atomic force microscopy indicated RMS value for NaOH samples increased with time exposure. Meanwhile, for C6H8O7 samples decreased with hot water treatment time exposure.

Effect of anodizing voltage and annealing temperature on the growth of titanium dioxide nanotube

Self-aligned TiO2 nanotube array were produced by anodizing of pure Ti foil in ethylene glycol electrolyte at different anodizing voltages and annealing temperature. The morphologies of the oxide produced were compared. It appers that the nanotubes formed are clearer showing significant changes based on the anodizing voltages and annealing temperature. The TiO2 nanotubes formed were increased in diameter as the anodizing voltages increased. The annealed TiO2 shows the decreasing in surface roughness as the temperature increased.

Growth of Nanostructured ZnO Nanosheet on ITO/PET Substrate Prepared via Sol Gel Spin Coating and Hot Water Treatment

Zinc Oxide (ZnO) is well known for its wide band gap semiconductor with large excitation energy that serves various application. These unique characteristics had gained much research attention on ZnO nanostructure synthesis and physical properties. In this study, ZnO thin films were deposited on ITO/PET substrate by a spin coating sol-gel process. The starting solution were prepare by dissolved zinc acetate dehydrate (ZnAc) and diethanolamine (DEA) in water (H2O) and 2-propanol (2-PrOH). Acid Citric (C6H8O7) from 0.2 to 1.0 M were dropped into 100 ml sol-gel solution to study effect of sol-gel environment condition. ZnO thin films were obtained after pre-heating the spin coated thin films at 100 °C for 5 minutes after each coating. The coated substrates were undergone for Hot Water Treatment (HWT) process at 90 °C for 6 hours to grow ZnO nanostructures. The effects of sol-gel environment condition by drop different concentrations of C6H8O7 into the solution were studied. Nanoflakes ZnO were obtained after hot water and hydrothermal treated at 90 °C for 6 hours with 0.2 till 1.0 concentration of C6H8O7 dropped directly in the sol-gel solution. On the basis of the changes in morphology and microstructure induced by hot water treatment, it is concluded that the nanosheets were highly transparent with the visible range (350 – 800 nm) with 70%-90% of Transmittance spectra. Growth of ZnO nanosheet influenced by increment of C6H8O7 mol concentration also with value of roughness RMS.