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We propose a novel “drop to measure” nanofluidic crystal sensing scheme with improved chip-to-chip data consistency here. Nanoparticles were self-assembled in a confined space guided by a well-designed surface chemistry treatment. The electrical readouts from different chips (n=5) varied within 4.8% (compared to 7.5% for 3 chips in the previous work). Biotin (using streptavidin -modified nanoparticles)...
Nanofluidic crystal (NFC) is attracting research interest as a novel nanofluidic material due to its various advantages over traditional microfabricated nanochannels. Crystal defects form during the self-assembly of NFC. In this work, we investigated the effects of crystal defects on the electrokinetics of NFC in the domain of micrometers (1–100 µm). We found that conductance of NFCs self-assembled...
Nanofluidics is attracting great attention lately as a novel energy harvesting strategy. This study presents nanoparticle crystal, which equivalently forms a network of nanochannels, as the functional nanofluidics structure for energy harvesting from concentration gradient by reverse electrodialysis. Ion concentration gradient was applied across a 40×40 μm2 micropore containing self-assembled nanoparticle...
Three samples of GaAs NWs grown with different n-type dopants flux rates were researched. From SEM figures, we can find that all NWs are vertical to the substrate and no lateral growth occurs. The growth rate is proportional the flux rates of n-type dopant SiH4. Larger SiH4 flux rate results in larger growth rate of NWs. For n-doped NWs, their growth were affected by Gibbs-Thomson effect, which is...
We reported a surface charge sensitive suspended nanoparticle crystal (S-NPC) as a promising nanofluidic-based sensing strategy. In the S-NPC, interspaces among nanoparticles construct a nanochannel network and provide nanofluidic electrokinetic properties. When electric double layers inside the interspaces are overlapped, conductance across the S-NPC will be directly related to the surface charge...
Interdigitated microelectrodes integrated with CMOS sensing circuitry are presented in this work for detection of the neurotransmitter dopamine and as an immunosensor with sensitivity enhanced by gold nanoparticles. Microelectrodes covered by the silicon dioxide layer are fabricated through a maskless post-CMOS process. Charged biomolecules bind to the functionalized oxide surface after immobilization,...
Presently, with the development of nanofabrications, patterning nanoparticles into monolayer attracts tremendous interests. In this work, a microfluidic-assisted nanoparticle monolayer patterning approach was proposed to produce noncontinuous patterns based on the well-known continuity equation in fluid mechanics. Soft-lithography used in this approach greatly reduced the cost and time of the fabrication...
This paper examines the potential for using the microemulsion method synthesized nanoscale Pd/Fe bimetallic particles to reduce trichloroethene (TCE, C2HCl3) in water. The water-in-oil (W/O) microemulsion system was made up of iso- octane, cetyltrimethyl-ammonium bromide (CTAB), butanol and water, and was characterized by measuring the conductivity of the solution. The changes of water content in...
Herein, a microfluidic-assisted dynamic assembly technique for close-packed nanoparticle monolayer patterning with high feature edge acuity and large-area uniformity is developed. Temporary PDMS microchannels are reversibly bonded to an oxidized silicon substrate whose surface is immobilized with 3- Aminopropyltriethoxysilane (APTES) to achieve a positive-potential surface. When the silica nanoparticle...
Critical diameter of nanowires (NWs) grown on a lattice-mismatched substrate by MOCVD was experimentally determined to be inversely dependent on mismatch. Quantization effect is observed with narrow and blue-shifted micro-photoluminescence for InP NWs on Si.
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