Ứng dụng

Quang phổ Raman là một công cụ có giá trị trong đặc trưng hóa vật liệu nano carbon nhờ tính chọn lọc cao, tốc độ phân tích nhanh và khả năng đo mẫu không phá hủy. Vật liệu carbon thường có phổ Raman tương đối đơn giản, tuy nhiên các phổ này chứa rất nhiều thông tin về cấu trúc vi tinh thể bên trong thông qua vị trí peak, hình dạng peak và cường độ tương đối.

In this Application Note, the electrochemical properties of electrodes with a micrometer-size surface area are compared with the electrochemical properties of electrodes with millimeter-size surface area. The comparison is made through cyclic voltammetry in a Fe3+/Fe2+ (ferro/ferri) solution, and the differences in the voltammograms are explained with the different diffusion profiles at the electrode-electrolyte interface.

Differential electrochemical mass spectrometry (DEMS) is used to monitor gaseous and volatile species during electrochemical reactions in situ.

Conventional methods used to analyze moisture, ash, fixed carbon, and volatile content in coal samples, are time consuming and costly. Near-infrared (NIR) spectroscopy is excellently suited to determine all parameters simultaneously in less than one minute without any sample preparation.

NIR spectroscopy offers fast, chemical-free analysis of ash, protein, moisture, and rheological properties in flour – ideal for routine lab or atline quality control.

Carbon materials are a remarkable choice as electrode surfaces. They are not only cost-effective and chemically inert, but also have a low background current and a wide potential window. Physical and chemical properties of new carbon nanomaterials depend mainly on their structure, so their characterization is essential to choose the right material for different applications.Raman spectroscopy is a very attractive technique for this purpose, effortlessly distinguishing information about the bond structure of carbon materials, and, therefore, about their possible properties. DropSens screen-printed electrodes (SPEs) are low-cost, disposable devices, available with working electrodes fabricated in several carbon materials. This Application Note describes how their properties can be studied by Raman spectroscopy.

Spectroelectrochemistry is a multi-response technique that provides electrochemical and spectroscopic information about a chemical system in a single experiment, i.e., it offers information from two different points of view. Raman spectroelectrochemistry could be considered as one of the best techniques for both the characterization and behavioral understanding of carbon nanotube films, as it has traditionally been used to obtain information about their oxidation-reduction processes as well as the vibrational structure. This application note describes how the SPELEC RAMAN is used to characterize single-walled carbon nanotubes by studying their electrochemical doping in aqueous solution as well as to evaluate their defect density.

This Application Note compares SPELEC RAMAN and a standard Raman instrument by analyzing their performance in measuring single-walled carbon nanotubes (SWCNT).