Spectrum-Quantified Morphological Evolution of Enzyme-Protected Silver Nanotriangles by DNA-Guided Postshaping
Li, JY (Li, Junyao)[ 1,2 ] ; Chen, RK (Chen, Runkun)[ 3 ] ; Zhang, QH (Zhang, Qinghua)[ 3 ] ; Chen, JN (Chen, Jianing)[ 3 ] ; Gu, L (Gu, Lin)[ 3 ] ; Zhao, J (Zhao, Jian)[ 1,2 ] ; Wang, ZY (Wang, Zhaoyin)[ 1,2 ]*（王兆寅） ; Dai, ZH (Dai, Zhihui)[ 1,2 ]*（戴志晖）
[ 1 ] Nanjing Normal Univ, Sch Chem & Mat Sci, Collaborat Innovat Ctr Biomed Funct Mat, Nanjing 210023, Jiangsu, Peoples R China
[ 2 ] Nanjing Normal Univ, Sch Chem & Mat Sci, Key Lab Biofunct Mat Jiangsu Prov, Nanjing 210023, Jiangsu, Peoples R China
[ 3 ] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY，201912,141(50),19533-19537
Quantitative morphological evolution is of great importance in nanochemistry. In this work, morphology of silver nanotriangles (AgNTs) is quantitatively evolved under the guidance of DNA. First, intact AgNTs are prepared relying on the protection of horseradish peroxidase. Then different regions of AgNTs are sequentially etched by C-rich DNA, leading to DNA-guided postshaping of AgNTs. In combination with atomically resolved images and theoretical simulation, a model is established to track the postshaping process. Since real-time morphological evolution of AgNTs is determined with spectra, a series of AgNTs with specific corners can be obtained by controlling incubation time. The DNA-guided postshaping is sequence and structure dual-dependent, and a mechanism is proposed based on metal base interaction, surface energy of faces, and freedom of DNA structure. In addition, the postshaping is further used to design DNA-mediated biosensors. This study provides a precise and quantitative method of controlling morphology of anisotropic metallic nanomaterials.