期刊
ACS NANO
卷 3, 期 12, 页码 3993-4002出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn900812f
关键词
Ag dimer; chain-like arrays; SERS; electrospinning; free-standing; large scale
类别
资金
- National Basic Research Program of China [2010CB934700]
- Program of International S T Cooperation [S2010GR0314]
- National Natural Science Foundation of China [50732006, 20671085]
- Chinese Academy of Sciences-The Max Planck Society
Anew and facile way to synthesize a free-standing and flexible surface-enhanced Raman scattering (SERS) substrate has been successfully developed, where high SERS-active Ag dimers or aligned aggregates are assembled within poly(vinyl alcohol) (PVA) nanofibers with chain-like arrays via electrospinning technique. The aggregation state of the obtained Ag nanoparticle dimers or larger, which are formed in a concentrated PVA solution, makes a significant contribution to the high sensitivity of SERS to 4-mercaptobenzoic acid (4-MBA) molecules with an enhancement factor (EF) of 10(9). The superiority of enhancement ability of this Ag/PVA nanofiber mat is also shown in the comparison to other substrates. Furthermore, the Ag/PVA nanofiber mat would keep a good reproducibility under a low concentration of 4-MBA molecule (10(-6) M) detection with the average RSD values of the major Raman peak less than 0.07. The temporal stability of the substrate has also been demonstrated. This disposable, easy handled, flexible free-standing substrate integrated the advantages including the superiority of high sensitivity, reproducibility, stability, large-scale, and low-cost production compared with other conventional SERS substrates, implying that it is a perfect choice for practical SERS detection application.
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