本文選題：碳納米管　切入點(diǎn)：石墨烯　出處：《天津理工大學(xué)》2017年碩士論文

【摘要】：碳納米管和石墨烯都是新型碳納米材料,均由sp~2雜化的碳原子構(gòu)成,都具有納米材料獨(dú)特的性質(zhì),如比表面積大、高的導(dǎo)電性、高的化學(xué)穩(wěn)定性、良好的生物相容性及電催化活性等,使得它們可以應(yīng)用于電化學(xué)生物傳感器領(lǐng)域。本文制備了適用于電化學(xué)生物傳感器的兩種電極材料,分別為金/二氧化鈦/碳納米管及金/石墨烯管復(fù)合材料,并分別構(gòu)造了同步檢測(cè)5種生物物質(zhì)的電化學(xué)傳感器。采用紫外光催化法把金離子原位還原成金納米粒子獲得了金/二氧化鈦/碳納米管復(fù)合材料,并采用脈沖電沉積法把該納米復(fù)合物修飾到玻碳電極上制備了金/二氧化鈦/碳納米管修飾傳感電極。由于金納米粒子、二氧化鈦納米粒子及碳納米管復(fù)合形成了三維的網(wǎng)狀結(jié)構(gòu),且在三者的協(xié)同電催化增效作用下,成功檢測(cè)到了抗壞血酸(AA)、多巴胺(DA)、尿酸(UA)、色氨酸(Trp)和亞硝酸根(NO_2-)這5種分析物,而同時(shí)測(cè)定它們時(shí)的線性濃度范圍分別為3-281μM、0.3-15μM、1-162μM、1-162μM和4-225μM,檢測(cè)限分別為1μM、0.2μM、0.6μM、0.8μM和3μM。該復(fù)合材料的特點(diǎn)是選擇性好,且適合涂覆于各種導(dǎo)電基底上制備低成本、實(shí)用的無酶?jìng)鞲性嚰�。采用熱絲化學(xué)氣相沉積法制備了自支撐石墨烯管后,再以多電勢(shì)階躍法把金納米粒子沉積在自支撐石墨烯管上,制備了金/石墨烯管復(fù)合電極。因金納米粒子具有高生物相容性及電子捕獲能力,而石墨烯具有大的電子遷移率及電催化活性位點(diǎn),可以同步檢測(cè)到AA、DA、UA、鳥嘌呤(GUA)和腺嘌呤(ADE)。該傳感電極檢測(cè)上述5種生物物質(zhì)時(shí),DA和AA、UA和DA、GUA和UA、ADE和GUA的峰電位差分別達(dá)到了208mV、140 mV、360 mV、264 mV,檢測(cè)AA、DA、UA、GUA和ADE的線性濃度范圍分別為4-600μM、0.4-20μM、0.6-40μM、6-500μM、0.6-40μM,檢測(cè)限分別為0.9μM、0.38μM、0.75μM、12.75μM和0.5μM。該復(fù)合電極的特點(diǎn)是選擇性好、檢測(cè)限低以及非常穩(wěn)定,且不必使用固體基礎(chǔ)電極,因此使用壽命長(zhǎng)。
[Abstract]:Carbon nanotubes (CNTs) and graphene (graphene) are new carbon nanomaterials, both of which are composed of sp~2 hybrid carbon atoms. Both of them have unique properties such as large specific surface area, high conductivity and high chemical stability.Because of their good biocompatibility and electrocatalytic activity, they can be used in electrochemical biosensors.In this paper, two kinds of electrode materials suitable for electrochemical biosensor, namely gold / titanium dioxide / carbon nanotube and gold / graphene tube composite, were prepared, and electrochemical sensors for simultaneous detection of five kinds of biomaterials were constructed.Gold / titanium dioxide / carbon nanotube composites were prepared by in situ reduction of gold ions into gold nanoparticles by ultraviolet photocatalysis.The gold / titanium dioxide / carbon nanotube modified sensing electrode was prepared by pulsed electrodeposition.Because of the gold nanoparticles, titanium dioxide nanoparticles and carbon nanotubes formed a three-dimensional network structure, and under the synergistic effect of the three electrocatalysis,鎴愬姛媯，

本文編號(hào)：1706547