2007
DOI: 10.1088/0953-8984/19/5/056003
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Preparation, structural and photoluminescent properties of CdS/silicon nanoporous pillar array

Abstract: A silicon nanoporous pillar array (Si-NPA) is a silicon hierarchical structure with regularly patterned surface morphology. Through a heterogeneous reaction process, nanocrystallites of cadmium sulfide (nc-CdS) were grown onto Si-NPA and a uniquely patterned nanocomposite structure (CdS/Si-NPA) was obtained. The nc-CdS, whose average size was evaluated to be ∼25 nm, mainly grew at two typical sites of the Si-NPA. One was the top sites of the porous pillars where nc-CdS clusters were formed, and the other was t… Show more

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Cited by 12 publications
(14 citation statements)
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“…The mechanism might be as follows. As has been proved previously [8] , Si-NPA possessed a nanoporous surface structure similar to that of traditional porous silicon (PS). The surface of PS has been proved to be hydrophobic [16][17][18] , which would lead to the surface being difficult for vapor adsorption but easy for vapor desorption.…”
supporting
confidence: 61%
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“…The mechanism might be as follows. As has been proved previously [8] , Si-NPA possessed a nanoporous surface structure similar to that of traditional porous silicon (PS). The surface of PS has been proved to be hydrophobic [16][17][18] , which would lead to the surface being difficult for vapor adsorption but easy for vapor desorption.…”
supporting
confidence: 61%
“…Although the sensitivity was greatly improved for capacitive sensors, the problem of slow response/recovery speed remains unsolved [6] . In the papers published previously [7][8][9] , we reported the study on the capacitive humidity sensing properties of a silicon hierarchical structure, silicon nanoporous pillar array (Si-NPA), through which a very fast response/recovery speed was achieved. The excellent response/recovery behavior of Si-NPA-based sensors was attributed to the formation of a regular pillar array, which was believed to have brought an effective pathway for vapor transportation.…”
mentioning
confidence: 99%
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“…Si-NPA used here was prepared by hydrothermally etching the (1 1 1) oriented, boron doped (ρ = 0.015 cm) single crystal silicon wafers in the solution of hydrofluoric acid containing ferric nitrate [17,18]. The microstructure and surface morphology of Si-NPA were investigated by field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM).…”
Section: Device Fabrication and Experimentalmentioning
confidence: 99%
“…Li). [17,18], which was a triple hierarchical structure constructed on single crystal silicon wafers, and excellent humidity sensing properties including high sensitivity and fast response rate were achieved in the Si-NPA-based sensors [19,20]. In this paper, the room-temperature capacitive ethanol gas sensing properties of Si-NPA were studied and the underlying mechanisms were analyzed based on its unique surface structure, morphology, and physical properties.…”
Section: Introductionmentioning
confidence: 99%