A motivating and fun activity for
students in introductory chemistry
has been designed to increase familiarity with the chemical elements,
symbols, and atomic numbers in the periodic table. This activity, Elemental Knock-Out, is a table tennis game, and the gameplay
is adapted from a box grid baseball game. Playing in teams for fun
and enjoyment, students work cooperatively with others to compete
against an opposing team. The game is designed for first-year undergraduate
students. The cost of one set of game materials is less than $50.
The average time required to complete one game, i.e., to become familiar
with the chemical elements and atomic numbers, is about 120 min for
a class of 60 students. This game was implemented with 118 students
including different grade classes. The results were interpreted through
poll and quiz before and after the activity. The results of the study
revealed that most of the students had positive impressions of the
game and considered it to be a fun way of interacting with the concepts.
The quiz test also showed an increase of average score of the students
by playing the game. Table tennis is a sport that anybody at any age
can play. Therefore, this game should facilitate the promotion of
knowledge of chemistry, e.g., the periodic table of the elements,
to the target student group.
To monitor humidity, the polymer-based humidity sensing material has become an emerging candidate because of its low-cost and low-power characteristics. To implement polymer sensing materials, however, the fabrication capability and stability are major concerns. In this work, an inkjet printable humidity sensing material, poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), is developed to improve the fabrication capability. Besides, different kinds of nanoparticles, SiO2 and aluminum zinc oxide (AZO), are also employed to enhance the stability and sensitivity to humidity sensing. Based on experimental results, the sensitivity can be improved by 100%; the stability can also be noticeably enhanced. To understand the sensing mechanism, X-ray diffraction (XRD), Fourier transforms infrared diffraction (FTIR), and photoluminescence (PL) spectrometer measurements are performed. Based on these material investigations, the sensing enhancement is due to physical adsorption of the blending nanoparticles. This work proposes a high sensitivity and low cost humidity sensing material for different applications.
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