Hypericum Perforatum (Sarı Kantaron) Çiçek Özütünden Ag/Ag2O Nanokompozitlerin Yeşil Sentez Yaklaşımı ile Üretimi ve Karakterizasyonu

Abstract

Gümüş nanopartiküllerin yeşil sentezi, nanoteknoloji alanındaki en önemli konulardan biri olup modern malzeme biliminin çeşitli yönlerini derinlemesine etkilemektedir. Bu çalışmada, Hypericum perforatum çiçeklerinin sulu ekstresi, gümüş ve gümüş oksit (Ag/Ag₂O) nanokompozitlerinin yeşil sentezi için kullanılmıştır. Çiçek ekstresinin UV–Vis spektrumunda, ortam sıcaklığında 450 nm’de güçlü bir absorpsiyon pikine rastlanmıştır. Tauc grafiği kullanılarak belirlenen tahmini enerji bant aralığı (Eg) yaklaşık 3.66 eV olarak bulunmuştur. XRD analizleri, tipik yüz merkezli kübik (fcc) yapıya sahip saf biyojenik Ag/Ag₂O nanokompozitlerinin oluşumunu doğrulamış ve (111) düzlemine göre kristalit boyutu yaklaşık 6.6 nm olarak hesaplanmıştır. FTIR analizi, AgNO₃’ün kısmi biyoreduksiyonuna katkıda bulunan biyoaktif fonksiyonel grupların varlığını ortaya koymuştur. Ayrıca, yaklaşık 653–816 cm⁻¹ aralığında gözlenen absorpsiyon bantları, Ag/Ag₂O gerilme titreşimlerine atfedilmiş olup nanokompozitlerin yeşil sentezini doğrulamaktadır. Her ne kadar pek çok çalışma H. perforatum kullanılarak gümüş nanoparçacıkların yeşil sentezini rapor etmiş olsa da, bu bitki ekstresi ile Ag/Ag₂O nanokompozitlerinin doğrudan sentezine dair çalışmalar nadirdir; bu durum mevcut çalışmanın yenilik ve önemini ortaya koymaktadır. Gelecekteki çalışmalar, bu biyolojik olarak sentezlenen nanopartiküllerin ileri malzemeler ve kaplama sistemlerine entegrasyonunu araştırarak fonksiyonel özelliklerinin daha da geliştirilmesini hedefleyebilir.

Keywords

• Ag/Ag2O
• yeşil sentez
• H. perforatum
• nanokompozitler

Green Synthesis and Characterization of Ag/Ag₂O Nanocomposites from the Flower Extract of Hypericum perforatum

Abstract

The green synthesis of silver nanoparticles is one of the most significant topics in nanotechnology, profoundly impacting various aspects of modern materials science. In this study, an aqueous flower extract of Hypericum perforatum was utilized for the green synthesis of silver and silver oxide (Ag/Ag₂O) nanocomposites. UV–Vis spectra of the flower extract exhibited a strong absorption peak at 450 nm at ambient temperature. The estimated energy band gap (E₉) was approximately 3.66 eV, as determined using Tauc’s plot equation. XRD analysis confirmed the formation of pure biogenic Ag/Ag₂O nanocomposites with a typical face-centered cubic (fcc) structure, and the crystallite size along the (111) plane was estimated to be around 6.6 nm. FTIR analysis revealed the presence of bioactive functional groups that contributed to the partial bioreduction of AgNO₃ into Ag/Ag₂O nanocomposites. Additionally, absorption bands observed at approximately 653–816 cm⁻¹ were attributed to Ag/Ag₂O stretching vibrations, confirming the green synthesis of the nanocomposites. Although numerous studies report the green synthesis of silver nanoparticles using H. perforatum (St. John’s wort), direct reports on the formation of Ag/Ag₂O nanocomposites via this plant extract are scarce, highlighting the novelty and significance of the present work. Future studies could explore the incorporation of these biologically synthesized nanoparticles into advanced materials and coating systems to further enhance their functional properties.

Keywords

• Ag/Ag₂O
• green synthesis
• H. perforatum
• nanocomposites

Supporting Institution

This study was not supported by any institution and/or organization.

Ethical Statement

The study does not require ethics committee approval or any special permission.

Thanks

Author thanks CUMERLAB and Asst. Prof. Deniz Kadir TAKCI for characterization analysis.

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