Simple silver nanoparticle colorimetric sensing for copper by paper-based devices

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Ratnarathorn N., Chailapakul O., Henry C.S., Dungchai W.

ผู้เผยแพร่: Elsevier

ปีที่เผยแพร่ (ค.ศ.): 2012

วารสาร: Talanta: The International Journal of Pure and Applied Analytical Chemistry (0039-9140)

Volume number: 99

หน้าแรก: 552

หน้าสุดท้าย: 557

จำนวนหน้า: 6

นอก: 0039-9140

eISSN: 1873-3573

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84866071551&doi=10.1016%2fj.talanta.2012.06.033&partnerID=40&md5=0ce3931c75d86d301b5372c107ddf9c7

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

The first investigation of silver nanoparticle (AgNP) colorimetric sensing of Cu2 by paper-based analytical devices (PADs) is reported here. AgNP colorimetric sensing for the detection of Cu2 was first characterized by UV-visible spectroscopy. The -SH groups on homocysteine (Hcy) and dithiothreitol (DTT) were used to modify the AgNP surface whereas the -COOH and -NH2 functional groups have strong affinity to Cu2 relative to other ions in solution. The plasmon resonance absorption peak intensity at 404 nm decreased and a new red-shifted band at 502 nm occurred in the presence of Cu2. Paper devices coated with the modified AgNP solution changed from yellow to orange and green-brown color after the addition of Cu2 due to nanoparticle aggregation. The color intensity change as a function of Cu2 concentration gave a linear response in the range of 7.8-62.8 μM (R2=0.992). The limit of naked-eye detection is 7.8 nM or 0.5 μg L-1. A color change observed by the naked eye with the addition of Cu2 can be clearly differentiated from the other metals (As3, Cd2, Co2, Hg2, Ni 2, Pb2, Zn2, Mg2, Mn2, Ca2, Fe3, Na, and K) at 15.7 μM. The use of different flow directions in the PADs and μPADs for Cu2 detection was also demonstrated. Levels of Cu2 in real water samples were measured using the paper devices to be 2.9±0.24 μM (tap water) and 3.2±0.30 μM (pond water), respectively, and were within error of the values measured using an atomic absorption spectrometer (2.8±0.08 μM in tap water, and 3.4±0.04 μM in pond water). Thus, this work shows the successful integration of paper devices and AgNP colorimetric sensing as a simple, rapid, easy-to-use, inexpensive and portable alternative point-of-measurement monitoring. © 2012 Elsevier B.V.

คำสำคัญ

Colorimetric sensing, copper, Paper-based devices, Silver nanoparticle