Doctor Blade Casting of Thin Films Containing Different Concentrated Endemic Plant Extracts: Determination of Structure and Optical Properties

Öz

This study provides a thorough properties of the optical analysis of the thin films which produced from Astragalus tokatensis Fisch., Helichrysum noeanum Boiss. and Stachys huber-morathii R. Bhattacharjee extracts. Methanol extracts of plants were obtained via Soxhlet extractor. The highest extract yield (10.10%) was determined in H. noeanum. Doctor blade coating method is used to make thin film layer on glass substrate. The optical behavior of the deposited films is tested by means of he UV-vis-near IR absorbance and transmittance characterization. It is found that the maximum transmittance spectra reaches nearly to a value of 90 % for A. tokatensis sample. Significantly, all the samples display same optical absorbace spectra behavior. Energy band gaps of the films are presented based on Tauc relation and were found to be in the range between 3.68-3.81 eV. Besides, the analysis of functional groups available in the materials is broadly studied by Fourier transform infrared (FT-IR) spectroscopy. FT-IR measurement also confirms that all produced films have carbohydrate pattern. These findings demonstrate a cost-efficient approach for the production of thin films with plant extraction, and open a new perspective on the potential applications of optoelectronic devices.

Anahtar Kelimeler

• Thin film
• Optical properties
• FT-IR
• Energy band gap

Farklı Konsantrasyonlardaki Endemik Bitki Ekstraktlarını İçeren İnce Filmlerin Doktor Blade Yöntemiyle Üretilmesi: Yapı ve Optik Özelliklerinin Belirlenmesi

Öz

Bu çalışma Astragalus tokatensis Fisch., Helichrysum noeanum Boiss. ve Stachys huber-morathii R. Bhattacharjee ekstraktlarından elde edilen ince filmlerin optik analizinin kapsamlı bir araştırmasını sunmaktadır. Bitkilerin metanol ekstraktları Soxhlet ekstraktörü aracılığı ile elde edilmiştir. En yüksek ekstrakt verimi (%10,10) H. noeanum’da belirlenmiştir. Cam yüzeyine ince filmlerin üretilmesi için doktor blade yöntemi kullanılmıştır. Üretilen ince filmlerin optik davranışları UV-görünür yakın kızıl ötesi aracılığıyla soğurma ve geçirgenlik spektrumları elde edilmiştir. A. tokatensis örneği için maksimum geçirgenlik spekturum değerinin hemen hemen %90’a ulaştığı görülmektedir. Üretilen tüm filmler, optik soğurma spektrumunda benzer davranışlar sergilemektedir. Tauc teoremine göre, üretilen filmlerin yasak enerji bant aralıkları 3,68-3,81 eV olarak bulunmuştur. Ayrıca, malzemelerde bulunan fonksiyonel grupları analiz etmek için Fourier dönüşümlü kızıl ötesi (FT-IR) spektroskopisi kullanılmıştır. FT-IR ölçümü neticesinde üretilen filmlerin karbonhidrat modeline sahip olduğu belirlenmiştir. Bu bulgular, bitki ekstraksiyonu ile ince filmlerin üretimi için ekonomik bir yaklaşım modellemekte ve optoelektronik cihaz uygulamalarında yeni bir bakış açısı sunmaktadır.

Anahtar Kelimeler

• İnce film
• Optik özellikler
• FT-IR
• Enerji bant aralığı

Kaynakça

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