Self‐Organization of a Hybrid Nanostructure consisting of a Nanoneedle and Nanodot

Abstract

A special materials system that allows the self-organization of a unique hybrid nanonipple structure is developed. The system consists of a nanoneedle with a small nanodot sitting on top. Such hybrid nanonipples provide building blocks to assemble functional devices with significantly improved performance. The application of the system to high-sensitivity gas sensors is also demonstrated.

Towards Perfectly Ordered Novel ZnO/Si Nano‐Heterojunction Arrays

“…FIB is usually used to prepare thin‐film samples in semiconductor industry or material science. In this article, ion beam was used to pattern the surface of the Si substrate, with the energy of 30 keV and the current of 0.46 nA (The current was an important parameter which would determine the profile of the Si arrays. Normally a larger beam current means a larger spot size).…”

“…In the present work, we introduce a simple way to grow ZnO nanorods on top of ordered Si nanoneedles, forming a perfect array of ZnO/Si nano‐heterojunctions with controllable shape and size. The ordered Si nanoneedle array was first fabricated on the surface of a Si substrate coated with thin layer of ZnO with a thickness of approximately 50 nm using the method that we developed previously and described in detail in the literature . Subsequently, the growth of ZnO nanorods was carried out through a hydrothermal approach, in which zinic nitrate hexhydrate (Zn(NO 3 ) 2 ·6H 2 O) and hexamethylenetetramine (HMTA) were used as reactants .…”

Fabrication of tailorable pH responsive cationic amphiphilic microgels on a microfluidic device for drug release

“…[11][12][13][14][15][16] DMAEMA-containing microgels have been synthesized previously using conventional methodologies, but none were amphiphilic or were prepared on a lab-on-achip. 21,[52][53][54][55][56][57][58][59][60][61][62][63][64] In several studies, DMAEMA was combined with Nisopropylacrylamide (NIPAM) to produce dual thermoresponsive microgels, 21,[52][53][54]56,64 or with other hydrophilic monomers or polymers. 57,58,60 Thus, to the best of our knowledge, this is the first time that amphiphilic, cationic, DMAEMA-containing microgels have been fabricated, made possible via the use of a microfluidic platform.…”

Ordered hybrid nanoneedle arrays for gas sensing

“…These unique properties of field ionization gas sensor are mainly attributed to the scale effect of individual ODNM and their optimized organization. For an individual one-dimensional nanostructure, it has the high aspect ratio that results in a flux convergence effect of electric field (geometry effect), to enable a dramatic reduction of the voltage bias required for gaseous field ionization [22][23][24][25][26][27]. However, even having this scale effect of ODNM, the previous reported field ionization devices still suffer a high operation voltage issue.…”

“…These interactions are believed to extend the recovery time cost by the desorption procedure. Meanwhile, the adsorption of gas particle may deteriorate the stability and reliability of local field ionization [24,26]. Hence, it is challenging to find a proper material system and compatible process to fabricate a hybrid nanostructure for enhancing the field ionization.…”