مطالعه نظری خواص ساختاری، الکتریکی و نوری نانوکلاسترهایBen@C20 (n=1-6)

نوع مقاله : مقاله پژوهشی کامل

نویسندگان

1 گروه شیمی -دانشکده علوم- دانشگاه لرستان خرم آباد ایران

2 گروه شیمی دانشکده علوم دانشگاه لرستان خرم آباد ایران

چکیده

دراین تحقیق، خواص ساختاری، الکتریکی و نوری فولرن C20همراه تعداد متفاوت از اتم های بریلیوم (Be) متصل برروی سطح آن بررسی شده است. نتایج نشان داد که پایداری نانوخوشه‌ها با اضافه‌کردن تعداد اتم‌های بریلیوم افزایش یافت و با افزایش تعداد اتم بریلیوم در اطراف C20، گاف HOMO-LUMO عموماً کاهش یافت ولی بیشترین کاهش در گاف انرژی (Eg) در دو ساختار Be4@C20-trans و Be6@C20 با گاف انرژی 69/0 و 49/0 دیده شد. همچنین خواصی مانند پتانسیل یونیزاسیون (I)،وابستگی الکترون (A)، پتانسیل شیمیایی (μ)،سختی کل (η)،نرمی کل (γ) ،الکترون‌دوستی (ω) و الکترونگاتیویته(χ) به عنوان خواص الکتریکی محاسبه شد. قطبش‌پذیری (α) و اولین فراقطبش‌پذیری (β0) که به ترتیب به خواص نوری خطی و غیرخطی (NLO) مربوط می شوند، محاسبه شد. مقدار اولین فراقطبش‌پذیری در نتیجه جذب 6 اتم بریلیوم روی سطح C20دیده افرایش قابل توجهی بزرگتر از (1000000<β0) را نشان می‏دهد. نتایج این مطالعه ممکن است برای طراحی و ساخت نانو مواد با خواص الکتریکی قابل تنظیم، مورد استفاده قرار گیرد.

کلیدواژه‌ها


عنوان مقاله [English]

Theoretical study of the structural, electrical and optical properties of Ben@C20 (n = 1-6) nanoclusters

نویسندگان [English]

  • Zohreh Khajehali 1
  • Hamidreza Shamlouei 2
1 Department of Chemistry, Lorestan university, Khorramabad, Iran
2 Department of chemistry faculty of science Lorestan university Khorramabad Iran
چکیده [English]

In this study، the structural، electrical and optical properties of fullerene C20 with different numbers of Be atoms attached on its surface are investigated. The results showed that the stability of nano-clusters increased by adding the number of Be atoms. By increasing the number of Be atoms around C20، the HOMO-LUMO gap was generally decreased، but the highest decrease was observed in Eg in the Be4@C20-trans and Be6@C20 structures equal to 0.69 and 0.49 respectively. Also، properties such as ionization potential (I)، electron affinity (A)، chemical potential (μ)، total hardness (η)، total softness (γ)،electrophilicity (ω) and electronegativity (χ) were calculated as electrical properties. The polarizability (α) and the first hyperpolarizability (β0)، which is related to linear and nonlinear optical properties (NLO)،were calculated. Significant increase of the first hyperpolarizability (β0>1000000) was observed by doping 6 atoms of Be on the C20 surface. The results of this study may be used to design and construct nano-materials with adjustable electrical properties.

کلیدواژه‌ها [English]

  • HOMO-LUMO gap
  • Ben@C20 (n = 1-6) nanoclusters
  • NLO properties
  • first hyperpolarizability
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