نوع مقاله : مقاله پژوهشی کامل
نویسندگان
1 بخش شیمی، دانشگاه پیام نور، صندوق پستی 3697-13395، تهران، ایران
2 مرکز تحقیقاتی بیماریهای عفونی و گرمسیری، دانشگاه علوم پزشکی کرمان، کرمان، ایران
3 پژوهشگاه علوم محیطی، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرمان، ایران
چکیده
در مطالعه حاضر، ویژگی های الکتروشیمیایی سیستئامین با استفاده از الکترود صفحه چاپی اصلاح شده با نانوکامپوزیتLa2O3/Co3O4 (La2O3/Co3O4/SPE) بوسیله روش های ولتامتری، کرونوآمپرومتری و ولتامتری پالس تفاضلی مورد بررسی قرار گرفت. کیفیت نانوکامپوزیت La2O3/Co3O4 سنتز شده بوسیله SEM، FT-IR و XRD مورد بررسی قرار گرفت. شاهکار الکترود صفحه چاپی اصلاح شده با نانوکامپوزیت La2O3/Co3O4 این است که سینتیک اکسیداسیون الکتروشیمیایی سیستئامین بوسیله کاهش پتانسیل اورولتاژ آندی بطور قابل ملاحظه ای بهبود پیدا میکند. بررسی های ولتامتری الکترود La2O3/Co3O4/SPE حساسیت بالایی نسبت به سیستئامین نشان داد که در نتیجه یک حسگر فوق العاده مناسب برای تعیین مقادیر ناچیز سیستئامین می باشد. نتایج نشان داد که جریان پیک اکسایش الکتروشیمیایی سیستئامین با غلظت آن در گستره غلظتی 0/1 تا 0/700 میکرومولار با حد تشخیص 3/0 میکرومولار ارتباط دارد. در پایان الکترود La2O3/Co3O4/SPE برای تعیین مقدار سیستئامین در نمونه های واقعی مورد استفاده قرار گرفت.
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