Gas sensing properties of single crystalline porous silicon nanowires

Abstract

We demonstrate that the porous silicon nanowires (SiNWs) prepared by metal-assisted chemical etching method could impart sensitivity of nanowire electrical properties to gaseous nitrogen oxide (NO) at room temperature, thus are suitable for sensing NO and air monitoring. Particularly, the sensors made from the porous SiNWs assembly showed fast response and excellent reversibility to subparts per million NO concentrations. The excellent sensing performance coupled with scalable synthesis of porous SiNWs could open up opportunities in scalable production of sensor chips working at room temperature.

Superlyophilic Interfaces and Their Applications

“…[125][126][127] In this case, etching is a very efficient way to construct large-area nanowire arrays ( Figure 6d). As described above, SLPL interfaces by increasing surface roughness can be obtained based on the θ IWT .…”

Silicon Nanowires and Related Nanostructures as Lithium-Ion Battery Anodes

“…The main difference of this study to ref. 41 and 44 is the existence of surfactant ethanol, which may be responsible for the different observations and interpretations.…”

“…Recent reports show that single crystalline porous silcion nanowires have been synthesized through both one-step and two-step reactions by adjusting the reaction conditions. [41][42][43][44][45][46][47][48][49][50][51] Highly Doped p-type Si (100) Wafer 43 One-step chemical etching involves the immersion of clean p-type silicon substrates in an etchant solution containing 0.01-0.04 M AgNO 3 and 5 M HF. It was found that the surface morphology of the as-synthesized silicon nanowires was highly dependent on the resistivity of the original silicon wafers.…”

“…This method has been widely studied for the synthesis of silicon nanowires starting from various types of silicon wafers with different doping levels and orientations, including lightly and highly doped p-type Si(100) and Si(111) wafers, lightly doped n-type Si(100) and Si(111) wafers and Si(110) and Si(113) wafers. [41][42][43][44][45][46][47][48][49][50][51][53][54][55][56][57][58] The metal-assisted chemical etching reactions can be classified into two types: one-step reaction and two-step reaction. Recent reports show that single crystalline porous silcion nanowires have been synthesized through both one-step and two-step reactions by adjusting the reaction conditions.…”

“…2,39,40 Recent reports of single crystalline porous silicon nanowires have combined these two features together and form both electrically and optically active silicon nanostructures. [41][42][43][44][45][46][47][48][49][50][51] The development of these multifunctional nanostructures may open new opportunities for a new generation of silicon based optoelectronics and photoelectrochemical devices. In this articles, we highlight recent progress in the synthesis of porous silicon nanowires, optical and electric properties, as well as their potential applications in the fields of energy and biology.…”