论文标题
在Au纳米群中生长的CDSE量子点的等离子体行为的光电和光声检测
Photocurrent and photoacoustic detection of plasmonic behavior of CdSe quantum dots grown in Au nanogaps
论文作者
论文摘要
在这项工作中，证明了Au plasmonics对集成硫醇连接的CDSE量子点/AU Nanogap结构在可见波长范围内光电流产生的影响。利用光声（PA）检测技术，可以感觉到等离子吸收。激光二极管被调制以产生PA激发，以振荡空气填充的电池。当光吸收增加时，麦克风捕获了增强的声学信号。观察到的PA响应中观察到的增强与Au层的等离子吸收有关，并且由于CDSE QDS而进一步增强了约20％。在我们的结构中，表面等离子体共振（SPR）波长约为500 nm。 SPR用于在CDSE量子点中产生光电。由于通过硫醇链路从点到紧密间隔的Au表面的能量传递，建立了一个光滑的电子传输通道，形成可检测的光电流，可以通过偏置电压调节。这些等离子体纳米含量结构可以使光伏，光电检测和感测的更高灵敏度。
In this work, the influence of Au plasmonics on photocurrent generation in the visible wavelength range in integrated thiol-linked CdSe quantum dot/Au nanogap structures is demonstrated. The plasmonic absorption is sensed utilizing photoacoustic (PA) detection technique. The laser diode is modulated to generate the PA excitation that oscillates the air-filled cell. When light absorption increases, an enhanced acoustic signal is captured by a microphone. The observed enhancement in the PA response is related to plasmonic absorption by the Au layers and the response is further enhanced by about 20% due to CdSe QDs. In our structure, the surface plasmon resonance (SPR) wavelength is approximately 500 nm. The SPR is utilized for generating photocurrents in CdSe quantum dots. Due to energy transfer from the dot to closely spaced Au surface through thiol links, a smooth transmission channel of electrons is established that forms a detectable photocurrent, which can be tuned by a bias voltage. These plasmonic nanogap structures can enable higher sensitivity in photovoltaics, photodetection and sensing.
