Retracted: Single layer molybdenum disulfide as an optical nanoprobe for 2 photon luminescence and second harmonic generation cell imaging |
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Authors: | Hong Zhong Lin Lu Yuanhao Wang Hongxing Yang |
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Affiliation: | Department of Building Services Engineering, Hong Kong Polytechnic University, Hong Kong, China |
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Abstract: | More recently, tremendous progress has been achieved in the development of two‐dimensional semiconductor materials applied in catalyst, energy application, sensor device and bioengineering since the birth of graphene isolated from graphite. Layered molybdenum disulfide (MoS2) as an indirect gap semiconductor can efficiently emit photoluminescence (PL) excited by visible light, which shows a great potential in adaptive biological imaging. However, 1 photon PL of MoS2 for cell imaging purposes suffers from strong autofluorescence and ion‐induced PL quenching. Herein, we report single layer small chitosan decorated MoS2 nanosheets as a nonbleaching, nonblinking optical nanoprobe under near infrared femtosecond laser excitation and their applications for strong 2 photon luminescence (TPL) and strong second harmonic generation (SHG) bioimaging. Furthermore, the TPL can resist the ion‐induced quenching on the cellular membrane. The proposed TPL and SHG of single‐layer MoS2 show great potential for real‐time, deep, multiphoton and three‐dimensional bioimaging under low‐power laser excitation. |
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Keywords: | bioimaging MoS2 photoluminescence single‐layer |
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